these pipes are still in the circuit for the central heating
So cut & cap these at the point they join the rest of the circuit.
looks identical to this
http://www.stovefittersmanual.co.uk/articles/cubic-5-convector-stove/
which is being sold for £400.
If I was feeling a bit brassic in the wallet, I’d be tempted to give the ebay special a go.
also if I fit it myself like I plan to will this affect my house insurance or do I need building regs or a hetas certificate
rumour has it house insurance won’t cover any fires caused by a non-certified install.
hetas certificates come from registered (pro) installers
building control, you can get them involved to do the same thing, cost depends on council, but expect somewhere between £150 – £250
in my experience BC were quite helpful – YMMV