I’ve had an email from my own blueyonder account saying it’s been hacked and states the password
That sounds like an extremely common scam where the scammers threaten to expose webcam footage of you unless you pay the scammer in bitcoin.
If that is the case, it will almost certainly not have been sent from your Blueyonder account but has simply been spoofed (faked) to make it appear as if it has. In a lot of cases the password quoted is one that you used for an online account linked to that email address rather than the email password itself. Obviously it's still worrying though.
Do you still use that Blueyonder account? Do you know that the password quoted is the real one?
These days you have to reset an account password via the "My Virgin Media" account for that email account so you could try resetting the password by entering the Blueyonder address and password here https://my.virginmedia.com/home/signIn
Once you have logged in click on Account Settings then Account details
Then click on the Manage Accounts tab and you will see an option to reset the password.
As a final thought, do you still use that Blueyonder account?
The reason I ask is that if it is not listed under the "Manage other Virgin Media accounts" section of your main My Virgin Media account it means that the email account is not linked to your current VM broadband account. That means it could be closed by VM at anytime as an "orphan " account because all VM email accounts need to be linked to a live broadband account.
If you don't use it then the easiest thing may be to ask VM to delete it.
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