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If you search on Google for 'list of expiring domain names', you'll get plenty of results, some offering a free search service, some asking for money. The same thing goes for 'expired' domains.
Hope this helps!
I take it you are referring to UK domains, if so!
Nominet caught on to what was happening a few months back, and now do NOT share this sensitive data to people as far as I am aware.
Good luck though, and if its generic .co.uk domains you want, I might know someone who can help.