Posted: 17/04/2016 at 14:24
Hi Lou, I use kneeling pads for my job as it sometimes involves kneeling on open grating, which is painful, good knees or not! You can buy trousers( Lidl and Aldi do men's and women's versions) which have a knee pouch where you can slip in the knee pads, much more comfortable than the strap on type.
Good luck with the South Downs, me and the missus have completed about half so far. Did the North Downs a few yrs ago and loved it.