I have looked on the gateway but cannot find the answer, I gave up waiting for HMRC to answer the telephone.
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As you don't have to ask / tell HMRC to join or leave the scheme then only the client / their records will give the answer.
Here's a (dumbed down gov.uk) link if you want something on file:-
https://www.gov.uk/vat-cash-accounting-scheme/join-or-leave-the-scheme
More detail is in VAT notice 731.