Have found some more photos but this time of a BR built LMS design Inspection saloon TDB999503. I don't know if they were identical to the LMS built one but here are the photos. There are a lot of them taken at Manchester Victoria taken on 29th June 1986. Unfortunately the parcels van blocking the view of the other side never moved whilst I was there, so I only got shots of one side. It's still only vac braked, but dual heated and by this time had acquired a mixture of roof vents.    
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