Our house presently has a Parkray solid fuel room heater, which stands
on a marble hearth (which comes out from chimney breast and only has
the front part of the fire visiable (surrounded by a stone "makeshift"
fireplace and the hole above has been boxed in with plaster board.

We have bought a free standing parkray chevin(solid fuel) and i am
wanting to open up the chimney breast, move the room heater
backwards(so it stands within the hole and be able to see part of the
flue)...and use the existing backboiler if possible

My questions are....

1) Is it a huge job?
2) where are back boilers situated? ( how big are they? will it need to
be moved? will it be visable)
3) where can i find any building regulations?(ie materials needed, does
work need to be checked?)
4) could the old fire still be used whilst the work is being carried
out?(its our only source of heating)
5) if the job is very complicated and we need to have professional
help....who do we need? builder? heating engineer?...any ideas on cost?
6) The new fire (bought second hand) needs a flue....where can we get
one? and what length will it need to be? (i dont know if the one from
existing fire will fit)

We are on a tight budget!!!!... we are willing to do any work we
can(thats not too complicated/risky)ourselves...but we need pointing in
the right direction.
Any advice would be greatly appreciated!

Cheers Shaz