You can have a look at Stroud High's list of Clubs & Sports Activities on their web sitehttp://www.school-portal.co.uk/GroupWorkspaces.asp?GroupId=22649&WorkspaceId=97220
. You'll find them towards the bottom of the Newsletters list.
They do have a lot of lunchtime activities, but there are afterschool activities as well. For instance, String Ensemble is Friday lunchtimes and Senior Orchestra after school Friday to 4:45pm. I know that many sports clubs also run after school.
Why not run them all at lunchtime? Well, there's only 5 lunchtimes a week, so having events after school allows children access to twice as many clubs. I suspect that many sports matches against other schools run after school hours.
Even living locally to the school I find myself picking the children up 2 days a week after their clubs, as we prefer them not to walk home along dark alleys (and they whinge about carrying large instruments home). There's even an instrumental lesson for one that runs after school one week in three (rotates with missing lessons), as they teacher can only start at 1pm.
We're happy with the situation - some inconvenience is OK to widen the opportunities open to our children, and compared with some non-school events, picking up is easy.