Again thanks to all the helpful advise and comments.
Went for a pair of green superfeet. Spent time cutting them to fit the current insoles and then tried them on Friday. Have to admit I carried the original insoles with me.
Was pleased and surprised to find no discomfort after 13 miles of Lakes walking. Had a little stiffness the following day but no more than I would normally expect. Was very pleased to find less swelling on my right knee, which is usual puffy after a walk.
Have noticed quite a lot of comment about problems with this sort of insole i.e. pain, heels being lifted out of the boot cup etc but not on Friday at least.
