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Interesting topic. We are actually working on compiling this information now. You'd think we'd have it readily available, but you would be surprised how seldom one asks how many of a certain tld we have. We should be able to offer that information at some point in the future.
However, as you can see on www.sedo.co.uk, we have over 4 million domains in our marketplace now, and the UK is the 3rd largest tld in terms of registration, so you can probably estimate that we have a relative figure on our database.
In addition, there is some interesting info here about countries and registrations: