If you address your letter to "The Chair" of the committee it won't matter who is elected to the position.
Another route is to ask your MP to ask a question on your behalf to the Home Secretary. Make it easy for them and write the question out yourself.
Maybe the GTA will have second thoughts as their action must be costing their members many lost sales as more and more buy from Europe. Now the GTA have highlighted the saving that can be made.
We are also now very clear on just where the GTA (and it's spokesperson) stand when it comes to airgunners, they couldn't care less about us.