I got in touch with Allen to replace my boiler based on internet reviews and his youtube channel (worth checking out, search for Allen Hart). I filled in the on line form on his website, he called me within an hour, came round the next day and he fitted the boiler at the end of the following week. What more can you ask for?! He is very knowledgeable and talked me through my options even offering to try and salvage my old boiler instead. He kept me informed through the whole process and turned up exactly when he said he would. He is extremely professional, friendly and did a great job. I couldn't recommend him enough and will definitely be calling him again next year for the boiler service.