I am assuming that you are Anna, local editor for East and West Sussex groups. I have recently joined GN and have started new threads on the B&H local and also general GN forum asking about the local B&H group.
So far not a single reply!! Is the B&H group still running? If not are you interested in trying to revitalise it? I'd be happy to help. On the east side of Brighton where I live, there is a free monthly magazine covering what's happening in the 'Deans'(Ovingdean,Rottingdean,Woodingdean
and Saltdean) and I'm sure there are other similar publications around Brighton. As community magazines I'm sure they would give a little space free of charge to advertise the website with a short description of what it's all about. What about a short flyer to go up in libraries, community centres, doctor's and health clinics, playgroups etc. They are the sort of places most grans who do active childcare go to.
Hope this gets to you, it is quite an old thread.