It's easy to tell the Government you want something done. You don't even need to post a letter nowadays because an email is recognised as a formal means of communication.
The best person to voice your concerns is the Parliamentary Under Secretary of State for Public Health. You can communicate with the minister by sending an email to your MP with a request to pass it on. You cannot contact a Minister directly unless you are one of their constituents. Alternatively, you can write directly the Department of Health, marking the letter for the attention of the Parliamentary Under Secretary of State for Public Health and Private & Confidential, with a copy to your MP, but doing this way does not guarantee that your communication will reach the Minister personally, although it will be answered by one of his\her aides. If you prefer to use that method you can use this online form or write to this address: Ministerial Correspondence and Public Enquiries Unit, Department of Health, Richmond House, 79 Whitehall, London SW1A 2NS.
To find your MP's contact details, please click here.
When you write to an MP or Minister it's a good idea to ask at least one question, so that they are obliged to read it and give an answer.