That's what he said. It was only the later plastic "super detailed" wagons which were insulated. However, local Hornby dealers had a lot of old stock on their shelves and towards the end very seldom ordered the new releases. I've long maintained the introduction of two-rail by Hornby hastened their decline rather than delayed it.
And I vaguely remember Hornby's horse-box did too but was only a partial solution to the problem
(kim)