My local Motor Factor (Smiths Autoparts in Nantwich) has sourced a replacement oil filter for me - the NAPA NFO 3196 - which I had not come across before.
As well as the original WIX WL 7064, the NAPA filter packaging listed some other compatibles I hadn't heard of before:
MANN W77
MAHLE OC11
PURFLUX LS169B
Always helpful to expand the repertoire I think!
.....and here's a pic of a next gen Westfield ownner who is currently getting familiar with the car and biolding up his automotive knowledge. He's already hooked......