Is there a reasonable degree of certainty that the points will transfer to the Tesco account before cutoff? I know they say upto 6 weeks ................
On the CC front, what makes the calc even more complex is considering the Nationwide debit card which always seems to be between 5% to 7% cheaper than credit cards whenever I've used both on the same day abroad. This sometimes makes miles a bit of a stretch as 7% is pretty good!