@ Day Dreamer - As I indicated in my post, the vote will be amongst BALPA members so I would have thought the answer to you would be to join BALPA. In my place of work we have people who work via agency, analagous to your situation I think, and I will always treat them as equals and represent them if they are Unison members. However you are also self-employed, if I understand things corrrectly, which means that your one man band company (that is what it is) is operating according to the T&Cs negotiated between your company and RYR, I am afraid that is the downside of the tax advantages you have as a 'company'.
@ ArthurBorges - What are you talking about? And location = China? Trolls in sight?