Done it a few times but wish there was an indoor track within a decent driving time from here. The nearest track (Welwyn) is outdoors and almost 2 hours away, I have no idea where the nearest indoor one is.
In the uk there are only Manchester, Newport (Wales) and Calshot indoor.
However there are a few outdoor tracks which tend to be larger about 400m in length than the indoor tracks (250m but Calshot is shorter i think).
We’ll be getting a new indoor one for the Olympics and also for the Commonwealth games in Scotland.
The outdoor ones of the top of my head are:
Halesowen
Necastle under Lyme
Herne Hill
Portsmouth
Wolverhampton
Brighton
Scunthorpe
Welwyn
Edinburgh
Go on i must have forgot one!
Most of these will run a track league during the summer, there’s something for everyone’s level.