The Bristol 2500:
@Dick Steinkamp suggested I might comment on unusual (or rather Series 1) characteristics. Those who actually own Series 1 cars may please read this carefully and correct me where I go wrong.
(Numbers of pictures are file names, not in the ad's actual order)
8415 S1 bonnet differs from later cars, also different pattern of holes on the inside.
8421 Three jets for windscreen wiping, two in the box where the wiper motor sits, projecting through the grilles in the bonnet. Centre one on the engine side of the firewall, projecting through a hole in the bonnet.
8422 Clamps on the airbox are metal brackets & wire, not just wire.
8423 RHD have two small brake servos instead of a single large one.
8440 Hole in the bonnet for the centre wiper jet.
8449 Non-heated rear screen, standard on 2500 S1, but tinted. Probably very rare, in Germany tinted glass was available only with heated rear screen.
8450 Original rear screen. It is evident the car was repainted at some point. This is not the only hint.
8455 Door front right with later glass pane. Script in the wrong place, has to be top front corner. Roundel appeared later. Compare pic 8442 door front left.
8456 S3 late version mirror. Trapezoidal mirrors from approx. mid-1969 to mid-1974.
8461 On RHD cars fusebox and bonnet release handle stayed on the left side. If you want to get to the engine open the passenger door first.
8468 Buttons seem correct for 1970. All mounted upside down here except for the up/down lever. Earlier S1 cars had three smaller buttons and none on the temperature lever.
8470 The metal thing below the hazard light switch should be the end of the trip meter reset cable with its button missing. Heard about it for the first time not long ago. Exclusive to RHD cars.
8471/8496 Both front doors are too young. Doors from late 1969 or early 1970 until about mid 1973 show two reinforcing fins. Younger doors, like here, have five. (Very old doors come without fins at all.) Don't know when exactly the changes were. Interestingly the left door has an old glass pane.
8500 No small glovebox on RHD cars, just a fixed blank plate.
8507 S1 dashboard with separate hood over the instrument cluster. RHD cars stayed like this until the end.
8510 S1 rev counter with two openings for the red warning zone.
8588 Grilles should be silver/grey on S1.
8593/8594 Front indicators Euro right, US/CH left.
8717 No beltline trim on S1. Car was modernised, aftermarket beltline trim, black grilles.
8722 Correct old headlights with convex lenses. Starting about 1971 flat lenses were used.
8725 Grilles on C pillar left the factory in exterior colour.
8726 Trim rings are S3. Wheelcaps should be correct for 1970.
8742 Normal drip rails, appeared some time 1970. Early S1 have slightly shorter ones with three screws on the A pillar.
8745/8793 Not a factory hitch, not mounted like explained in the shop manual.
8796 Inside of S1 bootlid shows different pattern of holes.
8804/8820 DIY mid and rear parts of the exhaust.
8827 Very old fuel tank, probably original. Nearly all cars today have replacement tanks that show an X on the bottom side.
That is not everything. Hope it will do for a start. If someone spots things, tell me. I'd be glad to learn more about S1, RHD and the E3 in general.