You can find out who your MP is via the internet by just typying in the name of the constituency if you know it in the field provided at this link, select the Search Constituency and click on the Search button just beside it on the right.
If this is done correctly and constituency name also spelt correctly, it will fetch you the result of the constituency which when clicked will lead you to the name of your MP which further details of him or her can be read by clicking on his or her name.

Or you can call the Clerk of Parliament on Tel: (233-302) 664042 to know who your MP is during working days of Parliament.