Hi, I see some most UK sellers are emailing ebooks when US sellers are using ebays digital delivery.

Well this can be done in the UK its just a bit harder to find.

Heres the ebay help page
Selling Digital Items

PS you may need to give a link to where your file is hosted, and if you dont have any webspace this could be a potential problem.
However if you search Google for free file hosting you should find a lot of sites where you can put your file for free!
(i cannot put direct links to non ebay pages in guides)