Kevin, do you need a license for a glider......
there is something very calm and relaxing about gliding
Not currently. There is a "gliding certificate" that is administered by the British Gliding Association but it is on the cards that we will end up being licensed in the next couple of years. Not necessarily a bad thing, as long as the powers that be recognise that there's a world of difference between a glider and a 747 (they don't normally).
The training route is very different for glider pilots. It concentrates on getting you in the air and building your skills as a pilot long before you need to start studying anything, and, even then, you only need to learn what's relevant to you and your safety in the air.
I like gliding because it's more about your skills at controlling the aircraft, reading the weather, making decisions on the fly and making the most of natural sources of lift. No two day's flying are the same in a glider whereas I have met power pilots who get tired of flying somewhere for a cup of tea and then flying back home again. It's horses for courses, I guess. It also is relaxing in a busy sort of way. The lack of engine noise helps I'm sure.
Kevin