well, that proved easier than I thought, I downloaded the GEDCOM file to my desktop as suggested by Gadget #5, then just uploaded it to FindMyPast, it was THAT straightforward, why I got Roots Magic involved I'm not sure, I think I got confused by just opening a GEDCOM file and the download/upload process.
Anyway, its in FindMyPast and seems to be working fine.
Thanks to everyone for the advice and assistance, its what this site is all about.