• Poor work carried out deemed ‘immediately dangerous’ and put lives at risk
• Illegal boiler replacement could have resulted in carbon monoxide poisoning.
• All gas work must be carried out by registered person.

A man has been given a suspended prison sentence after he carried out dangerous and illegal gas work on a property in Bournemouth which could have resulted in carbon monoxide poisoning.

David McCallum, 58, trading as McCallum Plumbing & Heating, attended a property in the Dorset town in February 2023. Part of the work carried out saw McCallum relocating a gas boiler and flue. However, following its installation, the homeowners noticed problems with it and had concerns over the standard of the work that had been done.

They arranged for another gas engineer to check the installation. When they arrived, they carried out an inspection and deemed the boiler to be ‘immediately dangerous’. The gas boiler flue was not sealed or correctly positioned which meant that there was a risk of carbon monoxide leaking into the property.

The matter was reported to the Health and Safety Executive (HSE) and an investigation found that McCallum had no training in gas work and was not registered with the Gas Safe Register (GSR).

Carrying out gas work without registration is illegal and potentially dangerous, as unqualified work can lead to gas leaks, fires, explosions, and carbon monoxide poisoning.

McCallum knew he should have been registered with GSR to undertake the gas work, as he had previously been a director of a company that had been registered.

The Gas Safety (Installation and Use) Regulations 1998 require those undertaking gas work to be Gas Safe registered and to hold the relevant qualifications to demonstrate their competence.

Members of the public are reminded that all gas work must be carried out by a Gas Safe registered engineer. Anyone can check whether an engineer is registered by visiting www.gassaferegister.co.uk or calling 0800 408 5500.

David McCallum of Balston Road, Parkstone, Poole, pleaded guilty to breaching Regulations 3(3), 27(1) and 27(5) of the Gas Safety (Installation and Use) Regulations 1998. He was sentenced to 10 months imprisonment, suspended for 12 months. He was also ordered to pay the homeowner compensation of £3,907 and £7,064 in costs at Bristol Magistrates’ Court on 13 February 2026.

In addition to this, McCallum was given a six-month electronic monitoring order restricting his movements over the weekends.

HSE inspector Simon Jones said: “David McCallum undertook gas work which he knew he was not registered to do – and his shoddy work replacing the boiler and flue meant there was an immediate danger of carbon monoxide leaking into the property.

“McCallum’s illegal gas work put the lives of innocent homeowners at risk for his own financial gain.

“All gas work must be conducted by registered Gas Safe engineers to ensure the highest standards are met to prevent injury and loss of life. Installers will be prosecuted if they carry out gas work without the proper qualifications.

“I advise all householders to check that anyone they allow to work on the gas supply is gas safe registered. This can be done in just seconds.”

The prosecution was brought by HSE enforcement lawyer, Julian White, HSE advocate, Rowena Goodwin and Paralegal Farhat Basir.

Further information:

1. The Health and Safety Executive (HSE) is Britain’s national regulator for workplace health and safety. We are dedicated to protecting people and places, and helping everyone lead safer and healthier lives.
2. More information about the legislation referred to in this case is available.
3. Further details on the latest HSE news releases is available.
4. HSE does not pass sentences, set guidelines or collect any fines imposed. Relevant sentencing guidelines must be followed unless the court is satisfied that it would be contrary to the interests of justice to do so.  The sentencing guidelines for health and safety offences can be found here.

1. Guidance is available: The Gas Safety (Installation and Use) Regulations 1998. Relevant guidance can be found at Gas Safety (Installation and Use) Regulations 1998 (GSIUR) as amended. Approved Code of Practice and guidance – HSE

• Apprentice fell through fragile roof.
• One company failed to properly plan for the work.
• Second company failed to produce documents as part of investigation.

Two companies have been fined after an apprentice fell from height while installing CCTV in Weymouth.

The then 20-year-old electrical apprentice had been working for Tristan G Murless Limited at one of their sites at a commercial industrial estate at Lynch Lane on 13 July 2022. He had been using a makeshift crawling board when he fell around 11 feet through a fragile roof to the concrete floor below.

The incident took place on the roof of a lean-to attached to a main warehouse. The project involved the installation of electrical cables and conduit around the perimeter of the warehouse in readiness for the installation of CCTV. The man lost consciousness at some point prior to the arrival of the ambulance and could not feel his body. He was unable to walk temporarily after the incident and sustained injuries to his back, including muscular tissue damage which requires physiotherapy.

An investigation by the Health and Safety Executive (HSE) found that Tristan G Murless Limited failed to ensure the health, safety and welfare of their employees, by failing to properly plan and provide suitable equipment to prevent the fall through the fragile roof.

• Working at height remains one of the leading causes of workplace injury and death and HSE has detailed guidance on working safely at height.

HSE guidance states that employers must ensure that work at height is properly planned, appropriately supervised, and carried out in a safe manner and that the planning should include the selection of work equipment. Every employer should take suitable and sufficient measures to prevent any personal falling a distance liable to cause personal injury. Workers should not have worked on the fragile roof where it was avoidable. Where roof work is not avoidable, edge protection, roof coverings and stagings or similar should be in use to stop a fall, with personal fall protection where needed.

A second company – Ellis and Partners (Bournemouth) Limited – has also been fined after they failed to comply with a HSE demand to produce documents to assist its criminal investigation into the incident. The request was made by HSE inspector Rebecca Gittoes under section 20 of the Health and Safety at Work etc. Act 1974.

Tristan G Murless Limited of Avon Close, Weymouth, Dorset pleaded guilty to breaching Section 2(1) of the Health and Safety at Work etc. Act 1974. The company was fined £16,000 and ordered to pay £4,168 in costs at Bristol Magistrates Court on 28th November 2025

Ellis and Partners (Bournemouth) Limited of Dean Park Crescent, Bournemouth, Dorset pleaded guilty to breaching Regulations 20(2)(k) of the Health and Safety at Work etc. Act 1974. The company was fined £6,000 and ordered to pay £1,200 in costs.

Speaking after the hearing, HSE inspector Rebecca Gittoes said: “Every year, a significant proportion of incidents, many of them serious and fatal, occur as a result of poor work at height planning.

“In this case, a young man at the start of his career was failed by his employer.

“Had the company suitably risk assessed the task, provided suitable work equipment and a safe system of work, this incident would not have happened.

“The case brought against Ellis and Partners (Bournemouth) Limited should also underline to everyone that the HSE and the courts take a failure to comply with section 20 very seriously.

“We will not hesitate to take action against companies which do not co-operate by failing to provide requested documents.”

This HSE prosecution was brought by HSE enforcement lawyer Rebecca Schwartz and paralegal officers Daniel Adams and Sarah Thomas.

Further information:

1. The Health and Safety Executive (HSE) is Britain’s national regulator for workplace health and safety. We are dedicated to protecting people and places, and helping everyone lead safer and healthier lives.
2. More information about the legislation referred to in this case is available.
3. Further details on the latest HSE news releases is available.
4. HSE does not pass sentences, set guidelines or collect any fines imposed. Relevant sentencing guidelines must be followed unless the court is satisfied that it would be contrary to the interests of justice to do so.  The sentencing guidelines for health and safety offences in Scotland can be found here.