Balance transfer from cc to bank account - any limit?

Hi all,

Looking at doing the credit card --> current account --> high interest a/c or premium bonds thingie.

I know from reading past posts on the matter that the procedure is to do the balance transfer to an overdraft.

My question is - Is there any limit (aside from that of your credit limit of course) that you can balance transfer in this ? Has anyone done a balance transfer in this way for say 10,0000 "overdraft" ? :) Would such an amount set alarm bells ringing?

Regds,