I've no idea regarding UK pricing, but if those are your options I'd suggest the FWB 100/103 series. Less front-heavy than the 46m and with a serious competition history. The 46m isn't bad at all and is certainly accurate. I won my first couple of medals at local matches with mine. But the grip had to be replaced, awful thing, and eventually I modified it extensively to get the weight down. I'd not recommend the FWB spring pistols, the 65 and 80, as they're quite heavy and rather further out of date.