Two bags bo***cks
Same thing *every* time at Bristol Airport, where the "security" staff have to have a degree in Jobsworth before they are allowed to put on the uniform.
I regularly carry 20+ PDAs in my hand luggage to demo to clients, so the laptop needs to stay in its own bag. Last time I was there the woman in front of me in the queue sailed past with a cabin bag and a handbag bigger than my laptop bag. Guess who got stopped.
I tried asking why she was allowed a huge handbag when my "man-bag" wasn't, but clearly he wasn't smart enough to get a Sex and the City reference.
So, open the case, remove 20 PDAs, spare batteries and mains adapters and secrete them all over my person... stuffed in 6 jacket pockets, trousers, in my socks, mains leads round my neck, etc. Put laptop in cabin bag, and head to security looking like a Michelin Man wired to explode at any second. The look on the faces of the security staff when my jacket went through the X-Ray machine made it *almost* worthwhile.
As others have said, get through security, and in clear sight of the staff, undo cabin bag, remove laptop bag, stuff everything back into cabin bag and bugger off onto the plane with both bags, where nobody gives a shit.