The Association of Plumbing & Heating Contractors (APHC) has expressed concern over eBay selling safety-critical gas components.

APHC warned that sales of gas components through non-recognised routes may lead to unsafe components being applied incorrectly, causing safety issues.

Rick Crees said: "There are thousands of gas and plumbing components for sale on eBay in various states of repair. It's a frightening thought that anyone at all can buy them and try to fit them, whatever their level of skill."

He added: "We believe that safety is being compromised, and, along with that, the reputation of the industry suffers.

"Also, although it is hard to prove, we know many employers fear that products appearing on eBay could have been stolen by unscrupulous employees."

Crees suggested of eBay, which says it complies with all if its legal requirements: "We would like eBay to go one step further by instigating a system whereby only registered engineers can buy safety-critical components. We have corresponded with them and are pleased to say that they are open to further discussions."