Glad to be of service sweetpea.
And to return back here to find something productive rather than what I feared was going to be one of those cchat odd cross-purpose arguments
I should really have included a link for the Oyster 60 plus thingy.
Belatedly and as a point of info for others, here it is:
https://tfl.gov.uk/fares/free-and-discounted-travel/60-plus-oyster-photocard?intcmp=54724
The process is very simple I think - I think you can apply a little time before the magic 60 arrives.
You will of course have to wait for your northern bus trips (if any buses still exist by then).
all the best.