Kate,
Basically we use 'drop' for the same thing.
We had a first birthday for my whole mother's group and the dads too on sunday and he was really really good. He was outside (of course!) but he didn't go silly really. I let him be silly once they left and we had a bit of a run around.
We have found a couple called 'underdog' who do dog training, however we actually have my parents over for 2 weeks and we don't want them to know anything at all about our little issue, so it is on hold for now. Once they leave in 2 weeks then we are going to arrange a first consult and then we will decide what to do next.
DH is right behind me and seems unconcerned by the cost, so that is good.