[quote name='DogHammer' timestamp='1369394248' post='2088662']
Am I being a bit tight and funny? or should I have been consulted?
[/quote]
No and yes respectively. As others have said, if they were inexperienced they may just have assumed it was the house rig. If not, they need to sort their manners and attitudes out!
I will normally let others use my gear if they ask, but if they didn't ask I would stop them and remove my gear from the stage. If they haven't bothered to bring their own - that's their problem. I would also take a look at the organisers too, who should have made the situation known to all bands beforehand!