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CYOA
(Presuming that the current shed doesn't fall within Permitted Development criteria).
As the shed has been there for more than seven years the Planning and Development Act 2000 has a statute of limitations which means that your Local Authority can't issue enforcement proceedings as more than seven years has passed.
However. If/when you come to sell a solicitor will be looking for the correct title on the property which includes a compliance with planning permission certificate, which you won't have.
To get this, you'd need to apply for retention planning permission. There is no guarantee you'd get this. If you have no plans to sell you could therefore ignore the requirement to obtain retention planning permission, as there is no danger of the LA attempting enforcement action.
If it does fall within PD criteria then what Soul/Sumo said.