Thanks for all the replies. Yes, showing US residence right now for BA so can't use Tesco, but I will try the eBay via eStore idea for an inexpensive product. If it's only a few dollars, it is worth the test. Thanks.

Followup: Can't even find eBay on my BA eStore site. See lots of eBay-related products...just no eBay as retailer. Hmm. I found Apple iTunes so have tried buying a $1.29 song. We'll see if anything processes.

(Oops! The iTunes deal was on US Airways NOT BA which doesn't allow such a small purchase. Still trying to find a cheap method.)