I did 37431 into town this afternoon and noted the following, rather trident free, albeit there is one in the garage naughty corner behind a solo:
1 - 18419, 19704, 19706, 19889, 19891
2 - 19701, 19888, 36937 (replaced 19701), 37437
3/7 - 48024, 48035, 48036
4 - 47352, 48031, 48032
5/6 - 27520, 27522, 27642, 27645, 27647, 34827, 36045
8/10- 47351, 47352, 47435
9 - 27521, 27643, 27646, 37431
41 - 34425, 37432
42 - 34829, 34832
50 - 15403 (1532)
51 - 19698, 19699, 34831
53 - 34428, 36043, 36044 displaying 53A
71 - 36936, 37438
72 - 34831
73 - 19699, 19701 after coming off route 2, 19893
81 - 19702, 19890, 34833
Turning back the clock to 31 December 2010 I went to Kempston and back with 16013 on a 1 and then Oakley and back with 16221 on a 51.
Also on New Year's Eve in 2012 I had 16593 to Luton on an 81 and returned to Bedford with 16581.