Merlin Cycles have some good fork deals at the moment. 

Bikeinn always have lots of Rockshox Deals. 

I'd have a look for a nice secondhand Reba, which should be well under £200.

these are a steal for what they are. the grip damper is very good. 

https://www.merlincycles.com/fox-32-float-performance-sc-grip-boost-mtb-forks-29-336966.html

they also have the reba for a little less, but it's not the 'current' version, so a bit basic (though OK for most things)

other than that as said, look out for used rebas or sids on ebay, but be aware there are a lot out there with incredibly short steerers. 

Those 32s with the Grip damper are a waay, waaay nicer fork than a Motion Control Reba. 

FWIW I ordered some 36's from Merlin yesterday afternoon, got another £25 off with my loyalty points, and they were delivered by DPD and on my bike by lunchtime today...

Yeah merlin are superfast delivery. I bought some 38's late Thursday night, again got £25 off with loyalty bonus (£325 ****ing bargain!) went for the standard delivery by DPD and they were delivered on Saturday morning while I was out riding. The wife took delivery and I hadn't told her I'd bought them yet!!

To be fair, shes good and isn't bothered. She says....

Thanks for the info everyone, while trawling through bikeinn I have taken a left field gamble on a suntour axon elite at £210 delivered. From the limited reviews online it seems like it should be way better than my ability needs but we will see!