I'm not sure if it's the same site, but the Cumbrian section of the V-CC used to use a camp site at Ecclefechan as a base for their century ride, otherwise known as the 'Ecclefechan long ride'. You could actually see the motorway from it!
As for the rest of the trip, it may be worth contacting various sites along the route to see if they want us to book, although as it's in school time it shouldn't be too much of a problem.
On the Classic Challenge last year, we had people using camp sites, hotels and occasionally wild camping, and for the most part it seemed to work well, with people gathering at the camp site most nights for a chat, drink and meal.
24th start works for me because on the 21st to 23rd I'll be at York Race course for the CTC rally, but if you decide to start earlier I'll join up with you wherever you are on either Sunday night or Monday morning. I suspect a lot of people will want a day to get to the start point anyway!
BX 19RD Estate Mk1 - Timex!
BX 4X4 Estate - Oh god, I've done it again!
BX 17RD MK1 - it called to me!
BX14 TGE, - SOLD
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