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Looks and reads uncomfortable with the .co.uk extension doubling-up with the uk word ending. It will never sell as a domain. Its just another confusable on anything 'tickets' imho
One of the problems of adding UK at the end of some domains is that it can be read as Tickets UK, or Ticket Suk. I'm not sure the latter would be appropriate for some businesses, so you are then relying on someone using it for the SEO benefits only.