Meet the Team

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Gemma Ollerton

Managing Director

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Carl Ollerton

Technical Director

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Jamie Green

Regional Director (Central & Southern Region)

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Craig Jenkinson

Operations Director

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Stephen Parry

Contract Manager

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Cath Dahl

Contract Coordinator

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Ben O’Berg

Contract Manager

Kerry
Kerry Houghton

Contract Coordinator

Alex Stelmach 2025
Alex Stelmach

Business Compliance & Admin Coordinator

Matthew Lowe Contract Supervisor
Matthew Lowe

Assistant Contract Manager

Sean
Sean Moran

Contract Supervisor

Some Of Our Customers

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With our extensive experience in Legionella Risk Assessment Services & Water Treatment Services Contact us today to find out how we can help you.

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GMS Spring Team Day 2026

Yesterday we got the whole GMS team together for our latest company day — and it was a great mix of learning, teamwork, and a bit of fun competition. We kicked things off in the morning with anti-harassment and mental health training, reinforcing how important it is to maintain a supportive and respectful workplace for… Read more »

More great feedback about #TeamGMS

👉 Another fantastic piece of feedback from one of our hospital clients in the South West—received by one of our directors. #healtcare #respect #dignity #workethic #communication #staff #culture #legionella #waterhygiene #commercialplumbing Hi Jamie,  Do hope you are well?  We had Ryan, Niall and Aarron on site these past two weeks. We just wanted to express… Read more »

Why are males more susceptible to Legionellosis?

Why are males more susceptible to Legionellosis? Males are consistently reported to have a higher incidence of Legionnaires’ disease than females — typically 2–3 times higher. This is due to a combination of behavioural, biological, and environmental factors: 1. Higher exposure risk 2. Pre-existing health conditions 3. Biological / immune differences 4. Lung capacity (possible… Read more »

What Is BSRIA BG29 & BG50?

BG29 (Pre-Commission Cleaning of Pipework Systems) sets out best practice for cleaning commercial heating and cooling pipework before it is handed over. When new systems are installed, they contain: Mill scale from steel pipework Jointing compounds and flux residues Installation debris Construction dust and particulates If not properly removed, these contaminants: Block strainers and control… Read more »