My fault as I only did a search on thomsonfly and it brought up the one you mentioned BJ but it was another company where you ask to be put through, etc. My search never picked up the others as they had spaces in them or were called thomson flights but I really should have just searched on
thomson
instead.
Anyway the other entries had different 0870 than that of ThompsonFly's website with the exception of the one for the Emergency Medical Helpline. I've just rung this number and was advised to ring 0870.
Update: Corrected a few typos.