no extra ID required - Only the same ID they ask from americans too.
No extra ID is required, but the bank will expect you to show proof that you are in the US with INS approval. A copy of the I-94 stamp in your passport is usually sufficient, but other immigration documentation may be requested.
If you have the time before you go (min. six weeks), your UK bank may be able to open an account for you if they have a US branch that is in the area you are visiting. It is a longer and more complicated process than opening an account when physically present in the US as the bank has to carry out additional checks to make sure you are not using the account for money laundering or other illegal activites.
Hope this helps.
Capt Sparky