Should you want to contact your MP you are only exercising your right to raise an issue of concern to you with your elected representative. On the whole MPs do listen to the views of their constituents and will very often follow up your enquiries by contacting the relevant government minister.

By letter
In the first instance write to your MP (this is your best bet), clearly  set out the issue which concerns you. This can then be followed up with a telephone call, email or personal meeting with your MP or her/his staff as appropriate.

Write to your MP at The House of Commons, London SW1A 0AA.  When Parliament is not in session (commonly known as a recess) many MPs work from their local constituency offices . During such times, their staff will forward  mail to their constituency offices.

 It may be some time before you receive a reply. Be as clear as possible about what you want your MP to do about the issue which concerns you.  Should the issue involves your local council, they may be able to direct you to your local councillor who is possibly in a better position to help. If you want your MP to raise your issue in Parliament or with ministers and civil servants, state this clearly in your letter.  MPs may be able to bring pressure to bear on ministers and government but will probably have less influence with other organisations (private companies).
 

Email
Most MPs have an email address -

They are sent many hundreds of emails every day so it is very important that you state, at the top of your email,  your lpostal address and your postcode. This will ensure that your email is immediately identified as needing attention rather than those which are usually ignored and/or deleted.

By telephone
You can telephone The Houses of Parliament  020 7219 3000. Ask to be put through to your MP’s office.  One of his/her staff will answer or you may be put through to an answering service. Insisting on speaking to your MP in person is not a good idea and may not get you very far. A lot of MPs time is spend away from their office either in Parliament, at outside meetings or doing other work. MPs’ staff are  authorised to deal with the majority of matters on their behalf.

Questions to ask:

Has your MP has had a chance to look at your letter

Do they support your campaign.

Can your and your friends, colleagues, campaigners can make an appointment to see your MP.

Surgeries
Most MPs hold weekly surgeries in their constituency. Normally held on Fridays or Saturdays.  Your MP's office can give you details of their surgeries failing that try the town hall, CAB, or library.  You may have to suffer a long wait to see your MP. Some are busier than others and use an appointments system.