I can't recommend this company enough. Having used them ourselves in the past, I recommended them to my elderly parents, who had been having boiler problems. This company treated my parents with respect, explaining things clearly and simply to two elderly pensioners who are nervous about dealing with the unknown.
They have fixed their boiler in the past at minimum cost and fuss, and recently when their heating failed because of a faulty radiator in the recent cold snap, they went above and beyond to fix the heating as best as they could till they could source a new radiator.
If only all companies could be as reliable, trustworthy and value for money as these guys - the country would be a much better place.