good luck with it all..
I am in the middle of ripping out my old fireplace to make way for something new..and I found a back boiler in mine - which I didnt know was there

...
have a look at my work in progress..there was a slight bit of dust...
back boiler is out this weekend...new breast being built and plastered also this weekend..
always hated that fireplace !
this is what I am having fit..or rather what I was told was being fit..
