By all means write to your MP, call me a pessimist but I doubt it will do much good. This government has shown no interest in listening to what the public think. We as a nation are expending all peaceful means of discourse (letters, petitions, protests, marches) on a range of topics like the sell-off of the NHS, real-terms pay cuts for public sector workers, cuts to vital services and critical welfare; and the result is no change. Even in the face of incontrovertible evidence and testimony from legions of industry experts (from all political leanings) does not sway whatever agenda the current government have.
Personally I have written to my MP several times in several different constituencies only to receive back the same cookie cutter party line on the subject and addresses none of the valid concerns I raise, I hear this same from others about their MPs.