For a full-length small-cast show, check out The Farndale Avenue Housing Estate Townswomen's Guild Dramatic Society's Production of 'A Christmas Carol.'  Side-splitting farce, cast of 5, if I remember correctly - 4 women, 1 man - playing all the characters in their own really bad and obviously under-rehearsed version of A Christmas Carol. They're bedeviled throughout by a totally disjointed script, flimsy cardboard set pieces, inappropriate props, ridiculous costumes, injuries, and their own egos. We did it over 10 years ago and still have audience members asking when we're going to do it again. English accents required  -- the language throughout is really too British to Americanize (although I imagine you Aussies on the board could have a field day with it with no trouble at all!). Available from Sam French.

The ?Farndales? are brilliant and there is a stable of about 7 of them about everything from the Mikado, a murder mystery, haunted castle, Peter Pan to The Scottish play. TFAHETWGDS are very easy to do & get the punters.
Another one comes to mind ?Fur coat & no nickers? by Mike Harding which as has 9M 5F if nothing else the title will put bums on seats. http://www.doollee.com/Agents/kCasarotto.htm
Also another about a hapless theatre group is ?The last Tango in Little Grimly by Tristram David 2M 2F http://www.doollee.com/PlaywrightsT/TristramDavid.htm#46803
Also Mike Harding wrote ?The last Tango in Whitby? about a Charabanc [coach/bus] trip to the seaside. But this may be a bit too much of a British institution for some groups there?
If nothing else do or even write your own Panto!