Thanks to all,
It's over a year now since I took up the rimfires again, I felt any 12g would give me trouble so only renewed my FAC. I must be missing at least 90 of shooting oportunities by being limited to the .17 and .22.
No pigeons magpies or even squirel. So I am going to try something. A couple of the best farms do have good shooting but you know the issue, neighbours that are anti, yet I can sit out there of an evening with the .22 and they don't even realise I'm there, hence the desire to try something quieter.
I'll get the cert redone, What's the legal position re borowin