Ossies in Faversham is definitely a nice one.
I used to love the one in Wainscott on the corner owned by a chinese family - was it called the Golden Fish Bar. When I used to live in Strood that used to be a regular of mine, and was much better than the one on Frindsbury Hill (terrible), and the one on Bryant Road. That was about 15 years ago now so it could well have been sold on / gone down hill but back 15 years ago it was top notch. Used to love getting scraps from there.
I have to give an honourable mention to Gordon Road Fish and Chips in Gillingham, which is definitely alright for a battered sausage and chips before a game if you didn't have time for lunch/dinner before you get to the ground.