barclays uk euro account?

Any transfer in or out will be treated as an international transfer and charged as such.
They did explain that to you - yes?

Whopper you need to have a serious chat with Barclays about this account.
If you make a transfer to this account how will it be done? It can't be done over a bank counter as we deal in sterling, you can't do BACS as again it will only do sterling payments (in UK).

There may well be rules stating that IN THE EURO ZONE transfers across borders should be free or only pay a nominal fee but UK is not in Euro zone and therefore the rules do not apply.

I will give you an example - you have Euros in a HSBC account which you want to transfer to the Barclays one - the only way to do this is to complete an IMT form at HSBC to send to Barclays - result a charge of about £20.

Another example - you accept a cheque in Euros from any bank which you want to deposit into your Barclays a/c - they will charge you to either negotiate or collect the funds.

A third example - you want to cash some Euros from the Barclays a/c - you will probably find a fee of something like 1.5% + £10 or similar.
The same applies if you want to pay cash (Euros) into account.

You say that they don't charge because its your money - I say (and I base my examples on another bank I have experience with) that does not come into it.

You have a foreign currency account (do they charge an annual fee?) and will be charged accordingly.

I don't think you need a sort code and account number to put money in but you will need the IBAN and BIC.