I have just had a complete new central heating system installed - New Condensing boiler, water tank with emersion heater & radiators. The company has finished the install and ( except the power shower ) everything appears to be working OK. However I seem to remember reading something about signing off the work in a blue book once the work had been completed. I saw a blue book but I was not asked to sign anything. Is this a legal requirement and should I be checking on any other detail which affects the proper set-up of the new system?