and now that i'm thinking about it....i wonder if those that currently have a GB license, but want to buy/drive a left side drive car, have to take additional tests or lessons? i'm not even sure if that's the case in the US either...if you want to drive a right side drive car if you have to take a test.
even tho drivers licensed to drive in both countries are essentially driving on the same side of the road and following the same regulations, i would think it would require more caution, awareness, etc. if driving a car on the opposite side that what is customary for each country. hmm...interesting thought....