Hi Michaela
We are hosting a London reunion in July and using one of the Daisy Green venues. They have a number of venues in central locations in London and one of the founders is Australian, so there’s apparently an Aussie vibe (and lamingtons!) which might work well for your event.
Happy to e-introduce you to the event manager, if helpful.
Caroline
Penrhos College
jenkic@penrhos.wa.edu.au