And not just evening services. During the 1980s, the X52 Abersytwyth - Swansea was jointly worked by Crosville (from the north) and South Wales (er ... from the south, obviously!). The journeys met just outside Llandeilo, and the idea was that the vehicles would work through, and the drivers would exchange vehicles. Both depots were supposed to use Leopards, but occasionally Aberystwyth were a bit short of coaches, so a somewhat long-in-the-tooth RE coach substituted. South Wales would not accept this (I believe because the RE lacked power steering), so when the RE ran the service, each vehicle had to 'kiss and turn', and it was the passengers who had to change.
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As an aside, (and when it DID work through!) the South Wales coach was then regularly used to work a lunchtime return on (Crosville) S12 to Ynyslas Turn / Searivers Caravan Site.
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It's also of interest to note that the concept of crews changing vehicles was the subject on the 'General Manager's Trainee Examination' for September 1944 - as quoted in Appendix 4 of W J Crosland-Taylor's book 'State Owned Without Tears'. I'm not going to reproduce the whole thing here - although the original book is long out of print, there was a reprint by the Transport Publishing Company in October 1987 under ISBN 086317 139 7 for anyone who's desperately interested, but the salient points are that the trainee is to plan a half-hourly through service from Birkenhead to Llanberis, via Chester, Flint, Rhyl, Colwyn Bay, Llandudno Junction, Bangor and Caernarfon, and specifically that:
+ Bus crews must start and finish at their own Depots but may change from one bus to another at any Depot
+ Individual buses may start at one Depot and finish at another, but if X buses start at any Depot the same number of machines must finish at the depot