We have a shortage of first generation DMU's on TS1 compared to diesel locomotives. The class 108 was the most common low density type after the class 101 and has been seen on all areas of the BR network except for the Southern Region. There are also many preserved examples. There are various payware and freeware routes which could utilise these and provide some variety. Sadly DMU's tend to be forgotten and I get the feeling that as long as there is a Met-Cam class 101 then that is all you ever need!