Por uma questão de resposta, já que OP mencionou se você mover seu comentário como uma resposta, eu aceito .
Para citar @ Comentário completo de AakashM :
Have a look at their website to see what their constituency contact arrangements are, they may want a phone call, but basically yes just tell them your problem and they may be able to help (at least with the 'this government department is not resplying to me' bit). You can use theyworkforyou.com to find out who your MP is, if you don't know