Just in case anyone wishes to follow a little more closely.
My Facebook post for 11th December reads:
“I Walked 920 steps at Blaise castle this morning! That’s about 0.5 km but not without difficulty ; severe paresthesia (pins and needles along the length of my leg) from the first step. Could not do it without my wife’s encouragement!”
Amazing to have doubled my range in a month (actually 920 steps is 65% of the 1400 steps I did on Sunday). Also The “539 Steps” post was on 15th Nov. That was going back another month when I did 400 metres.