On his Web site the survey details say it closes 24 December, and than only Battersea constituents are eligible for the prize; in his letter he points out that the general election will be in June at the latest. So he's starting his campaigning by getting us charged to to receive a survey with a prize we're still not eligible for... (no, I really don't want another TV, it's just the principle of the thing)
It's very hard to find out who complaints about MPs are supposed to go to: my best guess was the Standards and Privileges committee...
EDIT: and they say
Complaints that a Member of Parliament may have broken the rules made by the House should be addressed in writing to the Parliamentary Commissioner for Standards. Guidance on how to do this is available here: