Just come back from the UK. Seems contactless credit card payments has taken off in a massive way there. My UK credit card has had this function for several years, but was the first time I used it this time round and pretty much anywhere that has a credit card terminal accepts contactless. On top of that it is now integrated into the London transport system and can be linked with Oyster, meaning you can use your credit card to pay for fares (like you would do with Octopus here).
We do have versions of this in HK (via visa and mc) but I don't think it has really taken off here. Wonder why?
Yes, I know you can use Octopus here, but with contactless in the UK you can pretty much use it wherever takes credit card using the same credit card terminal. Octopus payments here require a separate terminal.