what you can do whilst you are on the trip: check the trans fluid level.
European Transmissions has a good write up how to test fluid level with or without trans dipstick
BMWtech.htm
also check if the fluid changed color or smells burnt.
To check which transmission type you have, check here under RealOEM.com Online BMW Parts Catalog
In the U.K. you have some good companies which repair automatic transmissions at reasonable prices.