Dear Jopa,
B.A. Concorde pilots do not have 5 stipes. They wear the same as all other B.A. fleets, 4 = Captain, 3 = Senior First Officer, 2 = First Officer (Note that the Conc does not have any 2 stipers in the right hand seat), 3 stipes on a purple background = Senior Engineer Officer (Senior Flight Engineer)
Hope this is of help.
Regards
Exeng