Thomas Cook confirmed that ;
G-FCLA,G-FCLJ,G-FCLK,G-JMCG are returning to lessors in the winter,
Also believe from Jethro and other sources that G-JMCD and G-JMCE were (supposed to be) leaving in Spring 2015
I would imagine the last bases to have the 757 will be LGW & MAN, that's my guess