Stoat's Nest

The two high arc roof LBSCR vehicles seen here on this E. J. Bedford photo of the up Newhaven Boat train at Lewes post 1889 remain unidentified. I have found a photo of what is described as a Midland horsebox kit (photos below), but there seems to be some doubt about who the kit's maker is, or was. There seems to be a similarity (compare photos), given that the Bedford photo is taken at an acute angle and the arc of the Midland vehicle is not a smooth continuous arc and its planking is vertical, not horizontal as on the Brighton vans. I've never found a drawing or Diag. number or a more detailed photo of the Brighton van, but it looks about the same length as the vehicle in front which is either a Stroudley PLV or a Bullion van. Its function also remains mysterious, but they always seem to have gone around in pairs. Anyone know the Midland horsebox kit's maker, availability or ceased trading?

An unidentified Billinton B4 heading the Brighton Pullman Ltd train in what is probably Bronze green/ red oxide roof and ornate gilded livery with open verandah Pullman cars. It has 7 full length cars and a Pup at the front. The head code on the buffer beam indicates its route is via the Quarry Line, opened in 1900.  I thought at first it was the Southern Belle, having 7 cars, but the Southern Belle didn't begin until November 1908  and its livery was Cream and Umber with white roofs, vestibules instead of open verandahs and ran on 6 wheel bogies, not 4.  A B4 was unlikely to still be in Stroudley IEG that late.  My Inspector Clouseau side came to the conclusion that the photo must have been taken sometime between summer 1900 and late summer 1908 somewhere between Norbury and Haywards Heath.  Can anyone hazard a guess at the name of this service and whether it ran from Victoria or London Bridge.