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If you try to use NFC with two cards close together, you get card clash - I have to carefully arrange the cards in my wallet to avoid this. I would challenge anyone to get a NFC read from my wallet when it is closed and I have 3 cards with NFC in close proximity to each other.
NFC is quicker, easier and cheaper than cash for retailers. It's been available for about a year here in the UK but now it's really starting to get traction.
I don't think that's a an issue relevant to this discussion since you'll just have the one NFC device, your phone, being used on a terminal. I suppose if your wallet is extremely close to the reader at the same time for some reason it would be an issue, but not really.
I didn't realize UK cards used NFC. I thought they just had the chip that the terminal accessed directly to read. Being able to wave your wallet like a phone does sound kind of handy, but as you mentioned, if you have more than one card (most people do) then it doesn't work well.