Can anyone confirm where i would stand in terms of warranty if i was to buy a Mavic Air whilst on holiday to The States?

You would have to send it back to the country of purchase (USA) for warranty issues. Read the T&C's

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You can get around this to a certain extent by buying DJI care refresh which can be used in the U.S., Canada, EU countries, the UK, Australia, Hong Kong and Mainland China
https://www.dji.com/service/djicare-refresh/info

I just received my Air from GlobalCentral UK. £800 Arrived on Wednesday. I ordered on the Friday.  Unfortunately it only comes with a one year warranty from Global not DJI. So I am hoping not to find out. PS when it was delivered I was a bit worried I would have extra Customs Duty but thankfully nothing.