Have had a thought (not sure if anyone has had the same). Is it possible to use a UK 4-way adapter (one of the long strips, not the block) with a UK-to-US adapter?

Reason I ask is I have a few items (laptop, iPad, phone, Kindle) and I don't think a hotel room is going to provide four wall outlets (or if it does, I'm loathe to buy four international adapters just for one trip).

I realise there's a voltage difference, but I'm not sure if this would affect a simple power strip (I'm in no way an electrician!).