Pretty sure I had a companion seat thing for re-triggering Gold, but can't find it anywhere. Do they expire? (even with Covid etc?)
I suppose answering my own question here and gonna have to proceed with the "ring Wales for help" tip.

I have also used Seat Spy in the past and found it really handy.
You get 24 months from the date you earned the reward to use it.
'Use it' means book a flight and take the outbound leg according to the website so not certain Simon's rollover method would work?