30817 waits near the Navigation whilst 37457 approaches in the rear. My interpretation of events is that the last Huddersfield working to Manchester had a problem at some point. To avoid there being no last bus over the Pennines 30817 was sent from Huddersfield and used the turning circle here to face in the right direction for the return trip. Meanwhile passengers had been advised to use the Diggle service if they wanted to continue towards Huddersfield and change buses here.