OK, this is a weird curve-ball, but here goes!
I spoke to the place we'll probably be buying the stove from today, but said "no mad rush, since I still need to apply for the building warrant". His reply knocked me back a bit: "You don't normally need one for Scotland you know, at least as far as I'm aware" This chap runs a stove shop, so I figured he ought to know! In fact, the only difference between him and the others I've spoken to is that he knew this was a supply only deal, and hence had nothing to gain by quoting me for the installation too.
So I've checked it out, and to my surprise, this is what I found deep in the furthest corners of the Scottish building regs (NB, this does not apply to England!!):
The following works do not require a warrant:
6. Any work associated with a combustion appliance installation or other part of a heating installation, not being work of types 7 or 8 below. ....Except........ Any work associated with a solid fuel appliance having an output rating more than 50 kW, an oil-firing appliance with an output rating more than 45 kW or a gas-fired appliance having a net input rating more than 70 kW. Any work associated with a chimney, flue-pipe or constructional hearth {NB, there's a special definition of what constitutes a constructional hearth}.
8. Any work associated with pipework, radiators, convector heaters and thermostatic controls for, or associated with, type 6 above.
9. Any work associated with installing a flue liner.
So there you have it, for what we're doing, I read that as no building warrant required!
Of course we'll still have to comply with all the building regs (the relevant sections are 3.17 to 3.22), but unless any of you can point out where I've mis-read, we don't have to wait for a warrant to be issued before we can start, neither do we have to be inspected once we've finished, which is definitely good news.
The other interesting thing is that Hetas don't actually have any legal standing in Scotland:
There are other organisations representing the solid fuel industry but neither they nor HETAS have a mandatory status.
So, when one of the stove shops told me previously that I either needed a warrant or a HETAS inspection, the actual truth is that I actually don't need either, but as a matter of course they issue a HETAS installation certificate with every installation, even though it doesn't actually carry any legal weight in Scotland.
No wonder people are confused eh?
Womble.