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The 321 thread (https://www.railforums.co.uk/threads/class-321-withdrawal-updates.212237/) doesn't say much about what is still in service but I suspect it would be whatever is required from the Renatus fleet (301-330), plus 901, 902, 903 and the 5 322s (481-5). I've not heard of any of them being stood down yet.
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