Hi there,
http://www.hen-night-fever.coxhXzsT5d.uk/
Links to a hen website where you can book iguana studios in Brixton for a music video but think you have to book through the hen website. I haven't gone there so can't comment but it may be what you're after.. Looks fun!
Also a bar on st johns hill called Jackson's may do cocktail making classes.. I have drunk them there and they're great but the amount consumed may mean I made this up!
If you're on st johns hill.. Don't be tempted by the BYO thai.. It is brilliant food but if you don't eat within the hour you will be frogmarched out!
Hope this helps a little..