ASL Group is the US NAS distributor, you can contact them directly for parts, questions etc.
You don't have to ship the table anywhere. All you need is a new 120V motor and a new pulley because of the frequency difference. You will likely pay more for it from Audiophile Systems though, compared to getting one from a dealer in the UK. They have more cost because of the tech support they have to keep on staff etc. You should have got one while you were in the UK. I'd still go thru ASL though because you may want their support later, and they have excellent support and service. And you could probably sell the current motor to someone in the UK via the UK boards like pink fish media to someone who wants a backup, assuming you won't need it again.