Quick dash in a company 747 from LHR to LGW in the rain; the speedbrakes didn't deploy on landing. Captain ( Chief pilot) turned to the F/E as we taxied past the Dan's Comet to write them up. I pointed out ( delicately ), that they'd missed them on the "before landing checklist", so they weren't armed. Big tall Texan F/E said "well ****, I guess we did an' all". Got my arse reamed for failing to point it out. Was told in no uncertain terms that on the ground, I was maintenance, but in his cockpit I was extra crew, so bloody well pay attention. So unlike the best ride I ever had - a Dan-Air Comet from Grotwick to Malaga to fix a DC8. What a great crowd, even on descent with condensation running over everybody like a shower. Only a Brit captain could draw everybodys attention to the wondorous azure blue sweep of the Mediteranean, while looking like he'd pee'd himself. Luverly.