Chrissy, you don't have to be a member of a club to show unless the show is members only!
If you wish you can be a member directly with the RPRA, SHU, WHU, NPA etc to obtain rings and then show at open shows where you don't need to be a member.
All the major shows are open to anybody registered to a union, some society's like the Midlands hold all there club shows as open shows so you only become a member if you wish to or want to compete for the trophy's.
My point was £10 to join a governing body is not a lot, compare it to joining other sports or Hobby's.