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You can never guarantee the weather at any time of year, but I would suggest March would be very challenging. Still very likely to get snow on the tops.
We only did true wild camping two nights. Once in the Cheviots (no other options on that leg), and the other time in a disused quarry on Saddleworth Moor somewhere, basically as close to the pub as we could find that was out of sight of the road. So not too extreme. The other times we went for proper campsites or at the very least pub gardens. I've wild camped all over the place so didn't bother me at all, but it's nice to have facilities and as stated we probably B&B'd it 3 or 4 times for a morale boost.
nauls
Yes, I did it in late September 1999 with a mate. Weather was mixed but generally OK.
Took 15 days. Fully self-supported, mix of camping and B&Bs when we got fed up with the rain.
I had a pair of old boots that were very comfortable, sadly they weren't the highest quality and a sizeable hole opened up on about day 3 so I had wet feet for the whole trip.
Frankly at times it was pretty grim but I was very glad I did it. Some memories: