Hi Steve
430 miles in 8 days cycling, though there was at least one, if not two, 1000-1600 metre mountain passes every day so hence the relatively modest mileage. I can't commend the Picos highly enough as cycling territory; very dramatic scenery, quiet and cheap outside of July/Aug summer months (went there previously in late Sept 4 years ago).
Probably best to there in the next couple of years if the pics inspire anyone: Spain is subject to the most incredible pace of development and there are already signs that significant chunks of the region will be lost to the encroachments of wholesale tourism.
The pictures are slightly misleading ref terrain, I was on roads, the pictures are taken just off them.
Gel Saddle about to be replaced as I was suffering discomfort on the longer days and its started to split. Will probably go for a Brooks B17. That and slightly sore palms aside, the bike ran like a dream, as always!
Cheers
Fred