13s are the best place to find them - there's a 13 turn that doesn't start until 0904 in Middlesbrough (the inbound 0826 from Hemlington is booked for a Trident, as is the 0819 from Brookfield) which can basically be allocated anything. 58 also seem to attract them, apart from the evening working (that is the 0931 35 and the 1032 58). 36/37/38 is the most unlikely place to find them, however they also have a late starting turn with the school holidays (begins in Stockton at 0823) which can be allocated anything as well.