Please confirm what iTunes.com/bill 08001076285 is for

We are fellow users, nobody on here will know what it's for. I assume that you've gone through the page that you posted from and checked the purchase histories of all iTunes accounts linked to the card (and assuming you are seeing it on your credit card statement) and not found it, and that you've also decided it's not an authorisation hold, you should be talking to the card issuer.