Yes, she is in Thornton near Fleetwood in Lancashire. The whole garden was planted in the 1950’s with exotics such as Tree Peony, Tassle Tree together with Laburnum, Camelias etc.
I only know Sesbania punicea, which is a bit more orange-y than yours is showing. See if it turns orange later... I wasn't aware of any other Sesbania available to UK growers however I'm not in touch with these plants too much..
What is so peculiar about this one is the very tiny leaf and the almost contorted twigs. They stayed yellow last year so think that must be the true colour.
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i don’t recognise the plant at all but I expect someone will come along soon with a answer.