Does anybody know anything about a small convoy I see most weeks. I am normally on the M1 between J15 and J13 around mid morning and see 2, 7.5 tonne Mercs going north with a police 4x4 front and back with blue lights on. They are normally across the outside 2 lanes and really getting on at a fair old lick (ungoverned to the naked eye) . The 2 Mercs are a light blue and have plain box bodies with no windows as you would expect in the prison transfer wagons.