Denys Edwards Players are also worth a look. They do a spring & an autumn production at the Library Theatre, and a summer production at the Crucible (in the Studio), plus the SADATA one-act festival. They have their own workshop & rehearsal rooms, and props and costume, and they do a wide range of stuff - Alan Ackbourne, Agatha Christie, Jane Eyre, and Wind In The Willows spring to mind. Some very good actors & directors, and a policy of sharing the limelight, so good for new acting members. Good reputation for sets, and two of their back-stage guys just retired so if you want to get involved, now's your time.
More info's on the website:
http://www.SheffieldTheatrePlayers.co.uk
Yours,
Steve Almond
Webmaster, Member-until-he-moved-to-Bristol