Having moved a boiler recently,, I checked with gas safe, re notification, they were happy not required just moving along the wall but room to room a whole new ball game and they wanted notification. re building regs, if he/she switched on they will pick up its non condensing and so will any new owners if they are on the ball, ie new extn as per building regs, why is the boiler non condensing!? be wary of bc advice it could cost you a sale. if your just renovating to sell then wack in a cheapo combi, youll have a warranty and notification and guarantee all which a buyer wants and their solicitor is now looking for.More and more solicitors are asking for benchmark tickets.notifications etc and if you dont have this your stuffed, I speak from experience as I also did property development until the world caved in last yr.
oldplumber you seem to know alot more about it than me, however from reading the regs my interpretation of the rules are if the gas apliance isnt new and or a replacement then you do not need to notify gas safe,? grey area Nigel get somthing in writing from gas safe etc.