If that is the case, I dunno why Dirty Donna didn't say...Or how long before they realise and fire the funds back at me? :/
But did think one ISA could be opened per tax year as long as funds weren't over the Government set limit...
You are correct you can have 1 ISA per year, or add to an existing ISA, but only one Cash ISA account can have funds added to it within a single year.
There is an ISA thread somewhere which it explains it all much more clearly than I could.
but in essence
Year1 - open an ISA, deposit up to allowance (we'll use 5000)
So one account 5000
Year 2 Add to existing ISA, or open new ISA, either up to the allowance, but not both.
New ISA might also allow the transfer of existing funds,
So either 10000 in original account 5000 and 5000 in two accounts, or 10000 in a new account where you were allowed to transfer the original balance.
Year 3, either add to existing or open new account, again one might be allowed to balance transfer
So either 15000 in original, 15000 in a new, or a combination of 5000 and 10000, or three 5000 accounts.
What you look to have done is move money for one ISA into a new ISA product. I am unsure if this will count as a transfer, its quite unlikely as usually specific ISA transfer revenue forms need to be filled in - it looks much more like you have simply deposited money into a brand new ISA. The source just happened to be an old ISA account. So you old ISA will be running a bit more empty than before, your new ISA is full for the year and your whole allowance has been used.
If its a new account, there will be a day or two for it to be fully functional, as the banks have certain checks and criteria to perform to get these things checked for money laundering, and for their full online functionality.