Are there specific train lines we should take (or purchase sites) to get from London to the little coastal town of Seaford (in Sussex)?
After our tour ends we will be spending a few days in London and would like to take a day trip down to Seaford to hopefully meet an author we're interested in at a personal appearance. The rail trip seems to be the fastest but it seems that we have a choice between the Gatwick Express to Brighton and a transfer or Southern down to Lewes and a transfer. Looking at the National Rail and Trainline sites doesn't give us any further insights. We will need to ride back fairly late that night and need our trip to be reliable, since we fly out the next morning.
Is there a preferred rail company we should try to book? Other than our flights, this is the only part of our trip that we have to plan ourselves and honestly we just need to pick the best option.