Good morning Maria,
Apologies for the delayed response to this, Liverpool was advertised as we were able to offer this option in 2012 in the September 1st edition of 2013 brochure. However, when the flight schedule was released by the airline we discovered that they did not offer the routes on the tour dates for 2013 and subsequently removed Liverpool as an option.
Sorry if this is an inconvenience to you,
If there's anything else I can help with, please just ask,
Kindest,
Ben