J7, My best advice to you is to learn your trails. There're all kinds out there, and I know of a few that I run on BF with joy while there are others that I won't go on ever again, even in my VFFs. I don't know what's out there in your neighborhood, but down where my wife grew up in Wiltshire, there are a few paths that are gorgeous for BF, being packed silt. Others have flints embedded in clay and I'd never want to find out how much they would hurt to run on. I've been in other areas in the UK where there's a plant called gorse, or wynn in Ireland. That stuff seemed pretty hard to deal with BF.
Once you have some fairly safe trails to try BF, you can learn to try them in varying states of saturation. I have trails that I run now that I know will have sections underwater from time to time, and I find them great fun.
Good luck and take your time.
btw, my wife and kids were just over for a visit for a fortnight starting on Boxing Day. It rained their entire visit, I think. In 2012 parts of the UK had the 2nd wettest year since records were kept . Lucky you!