In reply to Wonrek:
Firstly thanks to all the replies, food for thought. Yes, I agree, trying on shoes is best and hopefully may do that very soon!
I did try a pair of Inov8, I think they were Roclite or maybe Mudclaw, straight out the box. Inov8 had a stand at a Lakeland Trails event, offering them for a try out, then return after the race, so I gave it a go. Have to say, I was impressed at the grip in the mud and no issues with comfort. But, it was a muddy, soft course and that is why I think I need the more padded shoe, as my runs tend to be on harder trails.