In reply to andyd1970:
I use Altra Olympus 3.5 as a trail running shoe in Norway and they work fine for me, I find they're a bit clumpy on the road. For road I have the Altra Torin 4. I'm sure you can get more cushioned shoes than the Olympus.
As for wear, I've done 400km on Norwegian trails (which by many accounts are much wilder than in the Alps or the UK), and they're still fine.
I've also used the Brooks Cascadia trail shoes, I found they didn't fit my feet as well, the toe box of the Altra was better for my feet and my foot seemed to float around the Cascadia, even though I really liked the Brooks adrenaline (road version) of the same size.
I also tried the Altra Timp 1.5, and they were completely ruined (the upper was ripped to shreds) after less than 100km of trail running here. Fortunately the return policy here is good, so I got a full refund, no questions asked.