have you looked don their website? they have a list of members and which area they are in. If you speak to the secretary Frank Miller he will guide you to a good breeder
www.britishloppig.org.uk01948 880243 or 07759 487469
There is one member listed, might be a good place to start
Simon Everett (Kent) 01580 852691 / 07768 056043
Good luck they are a fab breed