Chiltern ran crew training runs over the course of several weeks fairly recently between Aylesbury, Calvert, Claydon LNE Junction, Bicester Town, Oxford and Didcot. These were mostly run using the blue/grey bubblecar 960 014, but 121 034 also ran them for the last couple of days before Chiltern took over the service from Oxford to Bicester Town from the start of the new timetable on 22nd May 2011. How many drivers were involved in these training runs I do not know.
There are pictures of quite a few of these runs on my site in the "May 2011" collection, this link will take you directly to that collection:
http://plumbloco.smugmug.com/Trains/May-2011/16902788_CKr2bQ
A few examples:
Passing the old station at Waddesdon Manor
On the level-Crossing over the Bicester Eastern Perimeter road (Charbridge Lane)
Passing the old station at Launton
There are also shots in the same collection of the recent tour with the Hastings "Thumper" tour "The Metrolander", which ran from Hastings to Quainton Road on 14th May, then ran a couple of shuttles from Quainton Road to Calvert and Claydon LNE Junction and return, example photo:
Thumper at Sheephouse Wood near Calvert
Photos all taken from public vantage points.
Images are "clickable" to take you to larger pictures on my site with full captions.
Cheers, Geoff