Well, as ever I've managed to have a spanner chucked in the works...
I've found a mint condition one owner rifle combo (with half decent scope) at a local dealer, which is now 'on hold' for me. It's from the Air Arms stable too; enter my '4th choice' and likely winner...
Air Arms S510 Ultimate Sporter.
See, I said at the start I'd no doubt end up going for none of the above