Event VAT

Hi there
Can anyone please tell me how to process following case?

We are UK VAT registered company and will do roadshow event for USA company in London ? Should we charge them VAT on sales invoice?

I believe we do not charge USA company VAT as the place of supply is the place where the customer belongs, but my colleague he think all events in London is VATable, irrespective of where the customer or supplier is located.

Does anyone could tell me who is right?

Many thanks
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