SAMSUNG DIGITAL SECURITY LOCK (SHS-1321) - on Amazon UK - but it £189!
I found this:-
SAMSUNG EZON Digital Door Lock SHS-2920 +2 Tag keys, PIN number, NFC Smart phone
On ebay and it was shippable to the UK - however it was clear that the 'box' on the back of the door was too big for our front door.!
There's only one sort on Ebay (uk) - anyone know a good source in the UK?