That looks relatively easy to make yourself Jamie if Derek can’t source something for you.
Haven’t seen anything like this myself but after you post did a search & they seem to come in a wide variety of sizes.
I don’t blame you Jamie, had a bit more of a look around & discovered that there were various ways they were constructed, a lot of them as you say were a fold away kit that fitted in a nice neat bag & poles a bit like tent poles that clipped together.
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