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My services are provide by me in the UK for companies based outside of the UK would this still be outside of the Scope of VAT?

Hi I have recently started a LTD company after being a sole trader for the past few years. I'm a consultant for a couple of companies and with new contract it looking like I may go over the VAT threshold but both the main contracts are for companies that are based outside the UK one of them in the US and the other in Australia? The rate has already been agreed and so what I want to know is if I'm liable to VAT or is it exempt as they aren't UK based companies?