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@Grimpeur
not wishing to reply to my own post but wanted to point out that after posting this the penny dropped and another 50mins web research tells me that to keep using my original 110BCD Sugino GT cranks I'd be looking for a 48T 110 BCD ring.
Notice there's many a post about these but all in the wanted and none in the for sale.
Have tried following the various (BMX) suggestions and cant find any 48T to reassure me they're obviously SS 1/8 and if I did it'd be £40
it was daylight when I started this research.....and now it's just a few hours til I have to get up for work.