Generally, the only organisations given a "free pass" to operate a paid for raffle/draw are registered charities. Any commercial organisation, which is what THBF is, requires a licence and a legally appointed auditor to validate results and ensure against fraud. As the membership are members of THBF, which is a commercial enterprise, then a proper licence would be needed. Small societies tend to be things such as the local kids rugby team, which have no commercial interests and fund raise merely to cover costs of kit and travel etc.
I hope that helps a little.
FatCol