Just to counter this whole British security people are w&nkers thing, I'd like to praise the people at MAN T1 who are almost without fail polite, courteous and often jolly. I've had occasional issues at AMS with extremely rough hand searches (almost complained to the supervisor on one occasion), and some pretty arrogant security personnel, but those seem to be a minority there.
The airport staff who really p!ss me off most in the UK are the miserable tw&ts they employ to check, sorry, glance at, my passport on arrival, who often cannot even be bothered to give an appropriate greeting for the time of day, or even say hello. And I thought we British were supposed to be good mannered...Their counterparts in AMS are most cheery and welcoming - they all carry firearms, so dont even really need to be polite to anyone!
UK immigration if you are reading - good manners dont cost anything!