I would inform HMRC - you can do it online I think. If not they might not link up the CT return to the Accounts - thats what happened to mine, despite HMRC getting a letter (excuse was the letter was processed the day after the payment!)
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Joanne
Winner of Bookkeeper of the Year 2015, 2016 & 2017
Thoughts are my own/not to be regarded as official advice,which should be sought from a suitably qualified Accountant.
You should check out answers with reference to the legal position