Triang and possibly Triang-Hornby produced one in the late '60s. Pretty basic by todays standards though and needs re-wheeling as a minimum. They do crop up fairly frequently on the second-hand market. Rather less common is the Hornby-Dublo or Wrenn horsebox as it is 'collectable' now and decent ones can be expensive - damaged or playworn ones are more affordable.
Hope this helps
David
Hope this helps
David