According to the House of Commons Information Office MPs are responsible to three main groups: Their constituents, Parliament and the political party they are affiliated to. … An MPs duties in Parliament would typically include taking part in debates and voting on legislation and other matters. They may also be involved in committees examining new laws or projects of other government departments.
MPs will typically support their own party by voting with its leadership in the House of Commons and acting as a representative for their party in their constituency. MPs will offer help to their constituents by advising on any problems which may arise from government departments, representing the concerns of their constituents in Parliament and acting as a figurehead for the local area.
One of the most important duties that an MP has to perform, other than to scrutinise legislation, attend debates and committees, is to protect, advocate and promote the interests of their constituency at a national level in Parliament at Westminster. However, MPs do not have the time to visit all constituents in order to update themselves with the way constituents feel about certain subjects. It is up to every constituent to make sure that his/her MP is fully aware of their personal views on any chosen subject.
Most MPs will hold a local surgery, on one particular day a week where you can express your views face to face. Alternatively, but not quite as effectively, you may call your MP’s office and make your concerns known to his/her staff, or write a letter or email. The important thing is that you make sure your MP is aware of your concerns over whatever matter you have in mind! A good MP will take the time to respond to your concerns or at very least, take them into consideration when debating and voting at national level.