My wisteria is wilting Can anyone suggest what is wrong with my Wisteria

have you had any rain lately? it has a lot of other plants around it so it could just need watering. try that and see if it perks up.
also have you been weeding at the base of it and perhaps damaged its finer water up take roots.

Thank you Seaburngirl.
I thought maybe it was just dry, and gave it a good soaking. I've just had a look at it, and it doesn't seem any worse, and possibly has perked up a fraction.