some c2w schemes and retailers used to allow you to contribute extra to raise the purchase over £1k - with that 1k getting the tax-benefit. I'm not sure if that's still the case, but if it is, then we still don't know the budget...
also, as Paul says, we would need to know the scheme's partner retailer(s) to give options.
I wouldn't expect to be able to chop and change (ie swap) wheels between bikes, as if they're different drive configurations (1x11 for a new hard-tail and 2x10 for an older full suss) then the rear cassette will be different for the different rear derailleur, so you'll be constantly swapping that (if the hub is the same fitting), not to mention the potential re-indexing and the possible different hub width standards... Basically - expect to be able to easily swap tyres and tubes. Running tubeless removes the tube-swapping and makes tyre-swapping a ball-ache, so basically, have 2 bikes and don't expect to swap much...
Trail riding, in my mind, is man-made paths and arguably trail centres, which are likely to have jumps and rollers (north-shore, drops, etc). I'm guessing you're meaning natural-paths, bridleways, canal-paths, etc. - so I still maintain you're after something more advertised as cross-country (xc) instead of trail. So, I'd try to look for a 29er to cover distances easily and ideal for bridleways and exploring fields/countryside. But, then saying all that, most of my riding is away from trails-centres (and what I think are trails) and I regularly find jumps or drops, so even though I'm not on what I think is a trail, it's still more than what I'd like to ride a xc hardtail on.
I/we're not trying to be awkward, or ****s, but just trying to get all the info to help the best.
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