JTL, I couldn't agree with you more: I think this action by T1 staff will only strengthen BA's resolve to implement iARM. There are plenty of Aviance's and ServisAirs (or whatever their LHR equivalents are) ready to take over the job at a moment's notice.
And if the iARM conditions are so restrictive, why hasn't T4 been affected? Different Union, different style?..
BA may be a bit obsessed about swiping in and out (qv the EWS wranglings at the mo), but with Q1 figures due out July 31 and expected to be poor, all the profits from the Concorde competition have been (more than?) wiped out by today's action and will indubitably have done more harm than good to the union's (and unions') cause.