Mudx are light, they are fine this time of year. A few days rain and riding in epping with nics will be comical imo. The chances of this weather holding up is remote to say the least. I aint a tyre expert but have used a hell of a lot. If you can get over to me I can lend you some to try. I have high roller,maxxis minion, panaracer rampage,maxxis medusa, nobby nics racing ralphs maxxis swampthings and mudx which you cant borrow
edit - triton cycles do mudx for £39 a pair and cycle surgery will match it.
Im not trying to change your mind if it seems like it, like I say tyres are personal its a shame we generally have to buy to try. Ive only had the mudx a couple of weeks be nice to hear a few other peoples opinions. mark how about starting a tyre thread and get more info.