So let me get this right, I've got the Mark 4 diagrams from the 225 Group when I asked about those a while ago - so off peak, the 0944, 1346, & 1544 southbound from Shrewsbury are Mark 4, the 1053, 1251, & 1447 northbound are also Mark 4, those times mentioned above - 0913 and 1113 southbound...