Originally Posted by F11UK
go to a Danish dealer. Persuade them to swap the xenons out of a car on the used car lot/management car. Do MOT, change them back straight afterwards.
Probably involves more work than that nowadays cos the clusters are identical on both RHD & LHD cars. The thing that controls the beams is the control unit so probably have to swap that instead of the clusters.
Probably the safest way is to swap the xenons for halogens just for the test, but need to ascertain whether the electrical connections match on both types of lights.