Caravan club credit card

I used to just have one credit card with HSBC until I recently got a new one through Barclaycard. So now with two cards, I'm spoilt for choice!

We have the replacement Barclaycard, as the points don't work out bad value and we should be to exchange them for M&S vouchers, which we save up for Christmas. However, at a glance it looks very similar to my Coop points card. I have tried to pay with that a few times, since the change. Does not work unfortunately.