Thomson Airways will be flying to Mauritius and Puerto Vallarta for the Summer 2014.
According to this article they will be flying from LGW - Mauritius and Puerto Vallarta and from MAN to Puerto Vallarta.
Thomson Launch Authentic Mexico and Idyllic Mauritius for Long Haul Summer 2014 - Press Release - Digital Journal
These flights will be released next week (25 April) when there Summer 2014 schedule is released.