I'd like to transfer my instant access cash ISA to another provider offering a better rate (sorry Tesco it's nothing personal!)

I'd like to confirm a few things before doing so:

1. Is there any interest penalty associated with this? I know there are for Fixed Rate ISAs, but the T&Cs for Instant Access didn't suggest there were.

2. Where can I find the current interest accrued on the account in order to give the new provider the total value of the ISA?

2a. Presumably I don't lose the accrued interest just because it hasn't been paid yet?