URGENT !! reliable BOILER repair person! (and a tip of who NOT to use!)

Hi Friends,

Can anyone recommend a BOILER REPAIR person who you have actually used and been very happy with the service? A SAFE RECOMMENDATION IS URGENTLY REQUIRED. If you're bored and feel like reading about my boiler problem, read on. Otherwise just reply with a recommendation!

When i moved into my place, the boiler worked fine but thought i'd have it checked over by a Gas Safe guy to make sure i wasn't being gassed in the night!  I invited FLAMEOUT over, who tinkered around and all seemed well. He told me my boiler was an older model but had plenty of life in it yet.

However, since his visit, (which was back in March), my boiler is behaving very badly.  I think it's a valve problem... If i use the central heating, the hot water will not work after wards.  This happened immediately after the FLAMEOUT visit and i called their receptionist who sweetly said the boiler service must've "awakened" some fault in the boiler.  I didn't call them back in, because i suspected they deliberately messed with my boiler for more jobs from me. GET REAL.

Anyway, over the summer, i had no need for the central heating, so hot water worked well.

Now the weather has gotten colder, i put the heating on the other night forgetting my problem and have been without hot water now for 4 days ~~~ The heating is on, without me turning it on. It's like all the hot water meant to come out my taps, goes into the radiators!  It's ridiculous!  I have to keep the boiler turned off completely, otherwise the heating is stuck on and the boiler overheats.

TIP: DO NOT USE FLAMEOUT !!!

Anyone have a better experience with boiler repair and servicing?

URGENT ADVICE IS NEEDED , also a shower! haha! There's only so much dry-spray-shampoo i can use.