If you buy from CRC don't forget the 10% discount from the £22 British cycling membership.
I'll have a look for some other deals, at 6ft 1in you'll definitely need a large, I'm XL in size at 6ft 3in.
Edit: that Ghost only has Fox 32's, you might find them a bit flexy for rough terrain, they're more of an XC race fork. You'll want fox 34's really. I can see some budget creep already starting to form

£1000-1500 to £1800...
You've missed a lot of the end of season deals on 2017 bikes, a lot of stuff is out of stock now.
£1500 is a bit of a difficult price, you're beyond the budget full sussers (bossnut) but not into the 'proper' spec FS bikes at £2000-2500, and a few extra hundred quid gets you a lot more.
I would stick to the direct brands unless you can find a stonking deal on a '17 bike:
YT jeffsey AL two - For that you get pike RC's and a Deluxe R, DT swiss wheels, reverb stealth dropper, sram GX (11sp) and Guide R brakes. Much, much better specced than the Ghost you linked:
£1699 https://www.yt-industries.com/uk/detail/index/sArticle/1364/sCategory/508
Or, if you want to say "sod the budget" there's this rather nice carbon
Cannondale Bad Habit in a striking purple for
£2k - Carbon frame, Pike RC's, Fox float DPS, X1 11sp, and Guide R brakes. Wheels aren't quite as good but then you get the carbon frame to offset that!!
https://www.rutlandcycling.com/bike...7boAN9kjwGsWTpSrTy6K6bn5LqMphZjBoC2hgQAvD_BwE
At the other end of the budget this can be had for
£900,
Vitus Escarpe with deore groupset, that's a dirt cheap FS bike and the frame is the same as on the £2200 model:
http://www.chainreactioncycles.com/...scarpe&icb=bspot2-c2-week47_2017_vitusescarpe
Otherwise you're looking at a 2018 model
Vitus Escarpe for
£1665 - Mostly SLX with revalations and a deluxe RT:
http://www.chainreactioncycles.com/...r-suspension-bike-slx-1x11-2018/rp-prod159743