Im with Skip on this one. As somebody who has been through security as crew (and pax) in more U.K. airports than not, MAN is by far the worst in this country, both in terms of waiting times/secondary search likelihood, and security staff attitude. God help you if you forget to remove your belt or epaulettes, or leave a lip balm in the bottom of your bag.
I had the full MAN experience a couple of weeks ago. The place is a dump, an embarrassment to the country. No wonder none of the US carriers will touch it any more.