That must be quite a runaround!
I can't help with a lawyer but have you considered/tried an appeal under article 6 of the Civil Aviation Authority Regulations?
If you really are getting the runaround - that is to say, you show that you are meeting the rules but the CAA won't do whatever should happen next - your appeal should be upheld. Much cheaper than a lawyer and less confrontational which might benefit you in the future. If it is of any help from my, albeit limited, experience, appeal boards are genuinely independent of the CAA staff that have made (or not made) decisions and try to find a practical solution if the appellant is not taking the P.