Think the trains will be out of their hands as it's up to the drivers union and their overtime ban/industrial action etc. Would be great if they did a full park and ride scheme, including West Hove site too.
Log onto the ticket site and check the tickets section of your account. If they are listed then don't worry about it and call supporter services in a few weeks and they'll email them to you again. Has happened to me before. Sometimes a email provider will block them temporarily if the algorithms...