No but don't forget that you must send off for your licence when you pass your test, if you don't within a certain amount of time it becomes invalid I think, but like Ethel says you don't have to own a car and be driving for your licence to remain valid once you have it :o)
Ahh yes just found it, it becomes invalid after
2 years and then you have to start all over again.
I know it's not quite what you were asking but thought it could have been what you were thinking or what someone else may have said and getting the 2 mixed up.
Anyway, always useful to know and be aware of this kind of thing :o)