UK power supply

Sorry if this is a basic question, but just want to double check before I plug in… I ordered an Organelle S from a UK store, but it arrived with a US power adapter. Can I just use a US to UK plug adapter, or do I need to use specific adapter with a transformer? Alternatively can I just plug in a UK 9V power supply? Thanks!

I’ve just put a bog standard adapter from wilkos on mine and nothing has blown up.