How do I become Hotel/Restaurant reviewer?

Hi, hope you can help. There's a job people tell me I would be excellent
at, and I've wanted to try for as long as I can remember. The time is now
right, but I need a point in the right direction to get started.

The job would be of the 'secret shopper' variety, only travelling around the
country/ies (I live in UK) reviewing hotels and/or restaurants, then doing
the write-ups you see in books such as the AA Hotel Guide, as well as
recommendations for adding/removing 'stars' from the hotel's name.

A few questions to anyone in the know

How do I get started?
Is it full-time, travelling from one to the next?
How long is the avg. hotel stay to assess?
Are vacancies hard to come by or are they always looking?
What is the avg. salary?
Are all expenses included (board, food, petrol)?
Do they favour husband & wife teams?

Any help gratefully appreciated. Thanks in advance.

Bob W.