If you have a thing for rare words, exotic idioms and saucy slang... if obscure etymology is your gig... or if you care where language comes from, we'd like to hear from you. We are particularly keen to find non-English speakers to enrich the international flavour of our work.

At this stage, we are only asking for people to signal their interest. There'll be no pestering emails and nobody will be 'selling' anything. As a Brain Trust member, we'll simply let you know what we're working on and provide an easy way to contribute ideas and questions. Above all, registering an interest doesn't commit you to anything. But if it sounds interesting and you want to see what it's about, fill in the form.