Right guys this is really stressing me out now! I changed my thermostat just to check it wasn't that as I got home one day at 5 and heating been on since 4:30 and house was 12 by 8:30 it was only 16/17 so heating was on all evening! Got a plumber to give me a price and that was £1100 for one type and £1300 for better one! then my shower pump started to leak so paid £200 for new one which is actually wrong but it's 2.1bar instead of 2.2bar so shouldn't be noticeable right? but what has pissed me off is we've been away this weekend came back at 6 hot water been on since 4 run a bath and had shower and water was only like warm I'm just sick of been cold and water been ****! i was going to flush system see what that did but I'm now thinking a combi would be better but that's gonna be about £1700 arghhhhhhhhh!