It's a contentious question Pat. The Jouef MK111's are based on loco hauled MK111's and therefore have three small roof pods on the ends of the coaches instead of the one larger square one found on HST hauled MK111's. The Lima models to my eye seem to capture the shape of the coaches better then the Hornby or Jouef ones. The Lima models are very poor in the area around the corridor connecters. The Hornby ones are better, but just by a little bit. If you can ignore the doors on all three models, then go for the Lima ones and get some flush glazing and new window surrounds from Southern Pride Models. Or if you really want to push the boat out get some laser glaze windows and etched window surrounds from Shawplan for the Lima coaches. If I was to do a Mk111 rake myself I would also tackle the doors. The Lima ones don't have the mould of the door opening lights, the Hornby ones do, and would need to be removed. The bogies aren't great on any of the models neither, the Lima ones being the poorest
As for the MK11A models they are correct for certain periods. The IE ones had the silver top lights painted black at the end of their life, and also had the roofs painted black like the M11 aircons. I don't think that Bachmann handled the painting of the IE MK11A's too good as the orange doesn't wrap around the end's as it should. However I do think that the Bachmann models capture the shape really well. I can't wait to see their MK11F models.
Rich,