There are still people posting on their Strava page, I know quite a few left and joined Knottingley Velo, you might be able to leave a message on Strava.
The Facebook group is a closed group and still active by the looks of things with 19 new posts in the last month.
https://www.strava.com/clubs/64258/members
https://www.facebook.com/groups/pontefractcyclingclub
I live in Pontefract and have been a member of Featherstone Road Club and Knottingley Velo,
I don't know what Fev do nowadays but I think they probably do the quicker more serious type of runs
Knottingley have a wide spectrum of riders, they cater for all types of cyclist.
BBM also cater for all.
The active South Elmsall riders I know are all pretty quick but the may have different groups, not sure.