Sometimes motion sickness is caused by not being able to see outside. If Angus can look out of the window he may not become so sick.

Ginger is a good idea as well for calming the stomach. He might be able to eat crystallised ginger (you might have to tie it to a postperson's leg to encourage him). You can get a device that fits into the lighter socket to heat up aromatherapy oils, and ginger there might help too.

Incidentally, Angus is not a Yorkshire name. He might respond better to Amos (Yorkshire joke!).

Les