No affiliation, but I've just bought a Secrid Slim Wallet through these guys

http://www.slimwalletjunkie.com/

The wallet is great - feels good quality & is very compact - small enough to fit in a front trouser pocket so less likely to fall out, or get lifted.

The RFID safe card holder does really only take 4 cards with embossed numbers as most UK credit cards have. But that's not a problem. The wallet will take a few more cards if needed, but I'm now using the KeyRing App to carry around digital versions of all my loyalty and membership cards incl. driving licence etc.

Takes a bit of getting used to not carrying around a big old wallet stuffed full of receipts etc. but it's really quite liberating.