No Musket 90, they shouldn't ever cross a red stop bar even if instructed to do so
Technically, not quite correct. An aircraft can be specifically instructed to cross a red stop bar if the stop bar cannot be supressed, there is no alternative routeing available and the aircraft is visible to the controller.
If the above conditions do not exist then a follow me vehicle is required to escort the aircraft passed the stop bar. (CAP168 Appendix 2B - I think)