Mike, there are two types of wallbox cable to car, tethered and non tethered.
Tethered – The wall box has a cable coming directly from it to a type 2 plug at the other end that goes into the car’s charging socket.
Non-tethered – Has a socket for a type 2 to type 2 cable (can be the same cable you carry around in the car for using the 7kW charging posts in car parks). Commonly a 5 metre cable, or in my case it’ll be a 10 metre cable as box to car is about 7 metres & you want the cable to lay along the ground as it’s fairly heavy and would stress the sockets at each end otherwise.
JS – I think I read that 15 metres from supply (the fuse box) to the wall box was the maximum included, but you’d just pay for the extra lenth of cable per metre. There’s always the worry about guage of cable needed over longer lengths, but it’s alternating current at 240V all the way to the car so it’s not the worry you get with longer cable lengths on the DC rapid chargers where they often use liquid cooled cables (now you know why they are so expensive).