My reading of this is that the OP is saying that as advertised the service is not available to many , which it should be either available to all in the area or nobody and the club should sort it out.
Metro buses cover most of the western area mentioned. Compass/Stagecoach cover Henfield so just a matter of sorting a deal with those companies. This shouldnt be difficult as Stage coach already cover the 700. Compass tickets are apparently accepted on B & H and Metro is the same parent...
I was thinking more of Metro bus, which is far better than Sussex Bus Co on all fronts. That would mean a walk to Stonepound X roads or 273 from Crawley although only every 2 hours.
I can understand the OP point as Metro Buses are owned by the same company as B & H buses so why do they not accept travel vouchers. Sussex Bus Co are just a joke with c..p drivers in the main, with a few exceptions.