I ended up getting a Focus Mares last year.
Thru-axles front and rear, threaded bottom bracket, hydraulic brakes, full carbon fork, loads of clearance for tyres (I use 40c WTB Nanos), and good geometry (on the slacker end of the scale).
The main downside being its a fairly heavy aluminium frame, and they might be a little over the £1k budget.
With a bit of haggling at my LBS, I got £100 quid off the asking price.
EDIT: one thing to double check regarding the whyte cx bikes is the sizing, they seem quite different to most other manufacturers.
EDITEDIT: also, it might be an idea to size down compared to usual when it comes to cx bikes. At 5ft9 I would usually get a medium mtb, but got an XS sized Mares which fits perfect.