[MrMessy]

I work with Americans and if I remember rightly British yellow transformers are centre tapped and not the same as the transformers we use to go from 240 to 110V. You will need a few transformers and leads for the power a band use? Have you checked if their equipment is dual voltage? Can they bring leads across with them? You may need to find a local American Base and see if you can borrow some equipment from them!