Hello,
OK I just popped over for you. There are Wye Street signs on both sides of the terrace on the junction with Borough Road

Alas they are not the original signs, they are white plastic ones which must cover the originals.
An original sign for Avon Street (the next street up) remains however,so I could get a photo of that so you would know the style of the Wye Street sign would have looked like?
Wye Street is now just a gap in the Borough Road terrace, they have blocked it off from traffic using a tree and some fencing, you can walk down it however to access the new housing estate (St John's Gate) behind it.
If you want any photos just let me know and I'll take my camera down there (I left the house with out it today, sorry).