it's not Castrol, it's Kestrel
from wikipedia:
In March 2008, the tourism division of the airline's parent group TUI AG, merged with First Choice Holidays PLC, forming the new company TUI Travel. Both Thomsonfly and First Choice Airways would be merged as Thomson Airways.
Thomsonfly Limited changed its name to Thomson Airways Limited in November 2008 and the Thomsonfly operating certificate was changed to Thomson Airways with effect from 1 November 2008. On that date, Thomsonfly and First Choice Airways both rebranded their operations to Thomson Airways, merging with a fleet of 75 aircraft. There is however an order of 12 new Boeing 787 aircraft which will make the fleet 75 once more.