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@knowthejo was into these, dunno if he’s got any knocking about.

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Have a word with Liz of http://www.beaumontbicycle.com/, I met Trevor Jarvis at her workshop about 4 years ago, they held a bit of a Q&A which I was invited along to as I'm local and a keen metalworker.

Liz and Tevor are both lovely and I'm sure will be able to provide some assitance. More info on her website; http://www.beaumontbicycle.com/flying-gate

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Couple of gates here, you'd have to win the auction, and not sure if anywhere near to you...
https://www.the-saleroom.com/en-gb/auction-catalogues/gardiner-houlgate/catalogue-id-srgard10144/lot-18bac199-53f8-4c9e-b45e-ab7a00ef6d6b

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