I used my new Asda card for the first time this morning... it'll be awhile longer before I make any payments. I'm happy to collect the £25 cashback and hold it as a backup 0.5% cashback card, regardless of any other purpose.
Fun with statistics, eh? If you put the full £2000 into an account for the full term then you get the maximum amount of interest, even if the APR is then slightly below 5%. We're talking about a difference that's a tiny percentage of interest on interest, so I'm not going to get too worked up about ...
If you can settle the Asda card by making a payment from Nationwide Select (which would be an anomaly itself, regardless of it earning cashback, since a credit card to credit card payment wouldn't usually be possible other than a balance transfer) then presumably there's no need to shift the funds v...
I'm using my Nationwide Select (0.5%), unless I expect to spend over £300pcm on VISA in which case I'll use my Halifax Clarity Rewards (£5 flat rate). If you can get the Barclaycard Cashback duo, that could be a good option keeping the extra AMEX to use with their lucrative exclusive offers.