AerBabe,
The Taylors at Cranwell do also have Number Fives as well.
As an aside, if you only did passed your Region Board in the last week, you may find that you won't be able to attend the dinner in uniform. My understanding is that even though you have passed the Region Board, you still need to wait for your Commission to be confirmed by HQAC - a process that can take up to six weeks. Until you have that confirmation, you shouldn't be wearing anyform of uniform or using any of the priveledges associated with a commission (use of the Mess, Claiming Pay etc).
Feel free to PM if you want more information.