Make good an old flue hole from inside

[Scott_D]

I need a clever idea or product if anyone can help.

I am removing a boiler from an upstairs back bedroom and fitting a new one downstairs.
I can't access the old flue to make good from the outside as there is a conservatory below.

Anyone have a clever idea or know of a product to help me do this from inside the house?
:builder:

 

[Mike Jackson]

In the past I've left the old flue in place and filled it with cement. Or save the core from the new hole and resin mortar it in the old hole.

 

[plumben]

I'd vote for cutting some bricks to the right size and bedding them from the inside and going outside to see if they look alright before they set, but dont push them out through the conservatory roof

 

[REDSAW]

leave old flue in!!
or
you will end up putting a hole in the roof!!!!

 

[Leo21]

Jet pack?

 

[Ch4 plumbing]

I think use a Couple of cans of CRAZY foam! We do need photos of before and after though.

 

[gasmanrob]

If it's plastic roof conservatory (the old wickes style) three screws and she slides out allowing you to put up a ladder and access it from outside. I've done one or two brick ups from inside and oddly they've looked quiet neat and married up nicely

 

[AWheating]

if the holes round fit a drain test plug