From the club site:
There are football park-and-ride sites for your use on matchdays, and the cost is included within your match ticket package.
Read more at http://www.seagulls.co.uk/news/article/home-fans-travel-239441.aspx#vhS2HltDxuCk23ez.99
Basically, it's going to very difficult to...
Just spoken to the club. Guy on the end of the phone sounded very sheepish and a bit guilty (although it's not his fault). He said that we can get a refund as long as it's 7 days before the fixture but I forgot to ask if it was only for customers who had booked before the club charter was changed.