You can ride a scooter or moped at 16 with a prov licence, but you cannot legally drive a car on a public road until you are 17 and you must have a prov licence beforehand - even then you must be accompanied by someone with a full one. Back in the day you could have a provisional licence for as long as you wanted but you had to renew it every 2 years or something (plus being able to ride up to a 250c motorbike), now I believe if you haven't passed a road test in 2 years, you are effectively barred for a year and then you can re-apply for another prov. However, it changes along with the wind direction so don't quote me.