I live in Herne Bay, Kent - are there any English Setter Rescue centres near me?

You can try:

http://www.lastchanceanimalrescue.co.uk/

http://www.dogstrust.org.uk/rehoming/searchcentres/canterbury/#.Ur7T4pCW_RE

http://www.sedogrescue.co.uk/

http://www.tagpetrescue.org.uk/

None of these specialise in English Setters, but you might get lucky. I found all this using Google, You may be able to find more.