Sanisbury's Gold CC - Free Cash Advances

saver84_2

I see that there are no fees for cash advances on Sainsbury's Gold cash advances. I have a Nationwide Select C/C with 0% on purchases and BTs for 17 and 18 months respectively. Thinking of applying for a Sainsburys Gold card, withdrawing the max in cash, and immediately doing a BT to my Nationwide card to avoid paying interest on the Sainsburys card. Has anyone thought about doing this? The only downside I can see is double fees (BT fee, plus £5 per month fee for the Sainsbury's card).

Thanks.