I recently photographed Clan Line at Bath, before it arrived with The Pullmans, a 166 unit headed out to Bathampton, on the 'wrong' line. I know that that section has bi-directional running, but have never seen it in operation.
https://www.flickr.com/photos/16582147@N07/48718530382
Clan Line.
https://www.flickr.com/photos/16582147@ ... 088/stats/