Plumbsorcedirect charged us £300 for changing automatic air vent which is £15 and that didn't fix our boiler's problem. I had boiler problem with pressure drop down quite often. I called plumbforce direct and the engineer came and looked it and agreed to fix the problems with £300. We agreed. Couple of days later, the engineer came and replaced a small part called automatic air vent in 5 minutes. We checked the pipe from boiler goes to outside and there are a lot of water came out still. Engineer agreed that was main problem caused pressure down often but he will need charge extra £180. That means replace a automatic air vent cost £300 without fixed the problems for us. We negotiated to pay less, engineer called his two brothers to our house and stopped our water supply .... We tried to talk to plumbforce direct, engineer told us he owns the company. Finally he agreed to reduce the price to £200. I would like to share the experience to all the consumers to avoid this kind of trouble again, they are just not trustable.