Starting out surfing - what do I need?

Alright guys,
I've had 3 surfing lessons now and I have decided I would like to take it up. With the waves closest to me (Brighton Beach, Sussex, UK), what kind of board do you reckon I would need to start out on (board, leash, fins etc.) I'm 5'9 and 65kg, have a good sense of balance and have a budget of anything below £500 ($650).
Thanks lads.
I've had 3 surfing lessons now and I have decided I would like to take it up. With the waves closest to me (Brighton Beach, Sussex, UK), what kind of board do you reckon I would need to start out on (board, leash, fins etc.) I'm 5'9 and 65kg, have a good sense of balance and have a budget of anything below £500 ($650).
Thanks lads.