It is an easily accessible map to depict the location of physical marker buoys on the water, which are not Crown Copyright. Hence why the document was not linked in my edit.

Hi Phil,

https://www.legislation.gov.uk/uksi/2016/654/made

Thanks, there was an issue with somebody tampering on my account, so this is definitely one to reverse.

Apologies, this was done by mistake. Thank you very much for correcting.

Many thanks. Apologies as I’ve been away but thank you very much for fixing it.