Splitting Cash and S&S ISA allowance

Hopefully a straight forward query, but one I can't find the answer to.

I have a Coventry BS Cash ISA and a Cavendish S&S ISA. My plan is to split my £20,000 allowance across the two. I have £10,000 sitting in the cash ISA and a monthly direct debit set up to pay into the S&S ISA (helps fulfill a Bank Account DD requirement).

I was wondering how the £20,000 is policed, as in who or what stops me going over the £20,000 amount between the two ISAs?

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