I thought this looked good value
Those Carrera Krakens are indeed good value for money. Bought my ex GF one of the older ones (2008 iirc) with cable discs, but for the ridiculous price of £265! For a bike with a double butted hydroformed frame (which is actually very good, well worthy of component upgrades in the future), a 100mm travel oil damped fork, cable discs, 27 SRAM gears, and well specced "womens specific" finishing kit such as saddle, shorter cranks and thin grips… I was very impressed. The only thorn in the side was the heavy OE tyres and tubes (Tioga's) and slightly overweight wheels. Lighter tyres and tubes were a very quick/easy win though.
At £399 with hydraulic brakes it's still pretty good value. That said, shop around, have seen them discounted by more than £50 inside Halfords stores…
Otherwise, if you're in Leek, pop into Swinnertons Cycles in Stoke. Not likely to get many bargains, but you will get a wide selection of bikes, and some knowledgable staff.
Or go mail order via Pauls Cycles, and look at bikes like that Giant linked to above… Or this one…