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What would you recommend for under £750 for general trail/XC riding?
Don't have one of those bikes, but check
Voodoo Bizango (29") and Voodoo Wazoo (27.5"+) if you like.
This forum: many, many happy owners of the Bizango. Bizango 2016 model sells for 0.5 right now?
http://m.gooutdoors.co.uk/calibre-line-10-mountain-bike-p414112
I like the look of this one. Modern geo and a dropper for £750.
Biketart has a range of Saracen Mantra bikes on sale and the "xmas10" code still works to give you 10% off so you may be able to buy a bike and dropper for your budget.
That Calibre has a great review in last months MBUK- it smashed the other 3 bikes on test out of the park for both geometry and kit on the bike.
The Voodoo bizango also gets good reviews but is a slightly different bike. Fast rolling 29er that’s still fun vs the Calibre which is 27.5 and more trail bike fun.
Go Outdoors have 15% off now using the code EASTER18 so that makes the Calibre even better value.