For the UK, the Cooler master QFR is hard to beat if you want black switches, or brown switches via mail order. Any other switches can be hard to track down but sometimes local stores hold them. the coolermaster TK has more switch options and backlight but isn't as well rated.
The Filcos are 114-120 quid new here and often 90 secondhand, so a bit out of your ideal range.
Poker 2s are often listed at around the 90 pound mark if you want the small sized keyboard.
If you want a full size 104 then coolermaster has the pro and trigger in your range but they aren't as well rated as the QFR.
Cherry g80-3000s are around 60 pounds new, the other sizes like the g80-1800 are similar price.
Corsair, Qpad and others exist here with usually one or two switch choices. Barring that there are the Razer blackwidow and the logitech g710 which are pricey and not well rated. If you can do without the UK iso layout, ordering one from asia is a cheap option, often around 60-70, such as the HPE and others from suppliers like Qtan.
eBay are pretty good for used cherry boards, although they can still pass the 45-50 mark for black ones. Beige ones usually cheaper. Theres a 3000 (blue switches I think) listed cheap atm but it will probably hit 45 with postage by the finish -
http://www.ebay.co.uk/itm/331080556939?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649I would suggest choosing a layout and if you need or want backlights and macro controls, and then go from there. Doing without lights and macros usually means a better quality board for the price.