Hi Stephos,
Thanks for contributing to our forum. Our system is actually configured to submit all bids directly through the US based eBay.com site, even those listed on other localized eBay sites, so it does not take us any longer to submit bids on items which were listed on the eBay UK site than similar items listed on the eBay.com site.
As such, we still feel that 5 seconds is the ideal lead time when using our service to bid on items which are listed on the eBay UK site.
I hope this helps.
-Mike