AlanB,
Did a quick check on US Coins on UK ebay and quickly found auction 130202584381
That's a US seller in San Fran, CA with auction on US ebay and it's showing on UK due to auctions "post to Worldwide" status on UK and "Ships to Worldwide" status on US. I have dual-monitors, so I looked at both side-by-side to compare.
I know I've checked my own auctions before on other than CA, but just couldn't say I'd for sure done it on UK.
Just search that number on both services.
Hope that helps.
Dan