Pieter,
In response to your question about the C2C or the Offa's Dyke walks, I would like to offer some observations. I have done both. Last year my wife and I did the C2C and we just completed the Offa's Dyke 10 days ago.The C2C was a bit more busy than the Dyke path for we saw no one walking the path for the first seven days. (We walked it South to North) We did see more people on the Northern part of the walk. I believe the Dyke path was slightly more difficult than the C2C, but just a bit. I do however think the Dyke path provided more consistant scenery than the C2C. Please understand I am not trying to take away anything from the Lake District, the Dales, or the Moors in terms of beauty. I just enjoyed the constant amazement of the landscape. I am pleased we did both for they each hold special qualities. If I was told I could only ever walk one of the two, I would choose the Dyke path. I am just pleased I did not have to make that choice.

Paul