Aldwick is right out near Blagdon Lake so not really that close to Bristol at all...there's yards out that way, I think Linzi Hardingham is out that way now - Hardingham Equestrian
I don't know anything about either of them though.
if your friend is working in Bristol and travelling out south home to Aldwick then those listed by Blucanoo above would be good too - as she would pass them on way home.