I have used a smart money clip for years all over North America, Europe, and Asia and loved it! It will hold 5 - 6 cards and loads of cash. Last time I checked, my own pockets work fine for coins. No need for bulky coin pouches and such.
Storus Smart Money Clip https://www.amazon.com/dp/B001RMO3NK/ref=cm_sw_r_cp_apa_i_rALMCbR44ZS3R
I use a money clip https://www.amazon.com/dp/B001RMO3NK/ref=cm_sw_r_cp_api_hByZAbYARAP87 I put my AP card on top when I’m at the Parks. That way, I can reach into my pocket and grab the clip to scan the barcode on top and scan in. I used to put the FP reminders in the clip when we had Signature but now we have Sig+ and use MaxPass so I screenshot my FPs on my phone in the case of the FP disappearing in the app. I also use my Apple Watch with Apple Pay when purchasing things so I don’t end up having to take coins or bills into the parks. Spending money has never been so easy!
Sorry, this isn't a leather wallet - but I've had this one for many years.
I don't see how a leather wallet could be BIFL, something that you hold so often. A metal one, on the other hand, can withstand a lot of in and out of a pocket without wear. This has been my experience.
There are many options available on Amazon of wallets that look like this. I'm sure there's one available in the UK. I didn't buy this specific one, I remember spending about $15. However, mine looks just like this one. I'd spend $30 on it if I had to. It's worth it. It meets all my qualifications and appears to meet yours too - just not leather.
Sorry, didn't mean to hijack, just food for thought.
EDIT - sorry this is late to the game, I originally posted this a while ago, but the autobot removed it for using a URL shortner.
If you can get away with using a money clip like this, they are really durable. I've had mine for the past 5 years and I love it.
I've been keeping this in my front left pocket pretty much every day ever since July 2009.
I actually got a black one but the finish wore off over time.
http://www.amazon.com/Smart-Money-Storus-Double-Sided/dp/B001RMO3NK
Get this instead, it is truly BIFL because it will never fall apart:
I've been using it for years and it's awesome if you don't need to carry more than four or five cards with you.