I did my aerobatic rating recently at Ultimate High at Goodwood. They impressed me a lot as an operation, and mentioned to me that they are looking for at least one additional instructor - if you fancy the South of England, they might be worth giving a call I'd suggest - UP training is a major part of their business. If you're unable to work in the UK, they might nonetheless be interested in talking about licencing - who knows, you can only ask.
https://www.ultimatehigh.co.uk/
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