Asics Gel Kakuna (Decathlon Exclusive)
Ran 500 or so km in these - work ok on packed trail, road (although like a lot of trail shoes they are firm) and the odd bit of mud. Cost me £45 in their sale.
Adidas Galaxy Trail (£30 in a Sports Direct sale)
Ok, the plus is their cushioning which makes mixed road & trail a bit more comfortable (on the road bits). I found myself oddly between sizes, settling on a 9.5, but they're probably a little large. I tend to use them as my long runs shoe now.
My friends like the Kalenji trail shoes, although they seem a bit firm to me. Also heard good things about the Karrimor trail shoes, albeit from someone who runs in anything at all