How do I know if I have chosen a Single or a Return?

If you would like to make a Single booking then you must only select from the Route 1 dropdown box. However, if you would like to make a Return booking, select from the Route 1 and Route 2 dropdown boxes.

For example:

SINGLE
Route1: Dover-Calais

RETURN
Route1: Dover-Calais
Route2: Calais-Dover