Birmingham International Station Car Parking

For the last couple of hours, I have been trying to find out about car parking at Birmingham International Station. The reason is that Celia has a case in Wolverhampton and feels that as the court is close to the station, it would be easier to use the train to cross Birmingham rather than the M6.

Other than the fact that there is 1200 spaces there, I can't find any other information, such as how busy they are, how you get there from the M6.

No wonder people drive rather than take the train!