with testimonials you have to invite riders that will at least get the locals in. Sam Masters has Freddie and Thorssel, Robbo having Harris, and Worrall has Lindback and Bewley
you might be able to get your bearings from these, i took them at variant points when down there - the first album
https://www.flickr.com/photos/the_womble/albums/with/72177720305325804
i was involved at Poole last season, found everyone at the club really welcoming and friendly, and seeing how things were done there i can see why they're winners
the old NL used to be British & Commonwealth only until Rye House screwed that up, British speedway would have been in a much better position now had that not happened