According to the club listings here on the Edge, nothing's active in Leicester. However, the Fever group in Loughborough has been quite active over the last number of years (it meets on Wednesdays and Sundays, so perhaps you could make one)
http://jugglingedge.com/club.php?ClubID=37
Lestival, a one day long juggling convention, (details for 2015 event here: http://jugglingedge.com/event.php?EventID=3826) is normally on early in May....
Hope that you find some jugglers to play with soon.