I noticed today that Yahoo! have launched Yahoo! Site Explorer UK & Ireland in beta. There seems to be no official announcement (or any other information on the web about this yet!) so I would guess it’s been released in the last couple of days.
The reason for the fewer number of links on Yahoo! Site Explorer UK & Ireland seems to be because this is very UK focused, some non-UK links are listed but this mainly contains inbound links from .co.uk and UK hosted .com’s. These also seem to be ordered with strong UK and Irish links at the top of the page:
This could become very useful for UK-based competitor backlink analysis! ;)