I haven't lived there since 1998, but lived there for about 18 years. There are lots of places that fit your criteria. I lived in Tideswell for some years. Small village with a number of shops and friendly locals. Before that I lived in Calver, which is nearer to Sheffield, but has no local shops.
It sounds like you want a small town. Although there is nothing wrong with Matlock and Ashbourne, I wouldn't call them semi rural. At one time I would have recommended Bakewell, but all the old local shops have now been taken over by outdoor outlet like Cotswold and Rohan.
Out of interest I weighed everything that was in my rucksack for my Arans trip last weekend. The total was 10.5kg and you can view the spreadsheet here. This doesn't include anything I was wearing. As you can see if I hadn't taken a camera and various gizmos, like the Kindle the total would be at least 2kg less.
I don't try to make everything superlight. The only really expensive thing was the tent, but I got this at 50% discount. I think you should be able to get down to this weight without too much expense.
I am up for a meet in N Wales or the Peak, as they are closest to me. However, family commitments mean that I can't commit to a specific date, but would try and fit in with whatever was arranged. Also will be in Borrowdale around 29th October (20th wedding anniversary). Just don't mention the time on our honeymoon when the headtorch failed and we had to stumble for a couple of miles through a wood in the darkness.