BMW has started offering Xenon headlamp retrofits on some models officially but they are very expensive. it appears some dealers are more comfortable with it than others.
As an example, here is a link to the old 1-series xenon retrofit:
http://www.bmw.co.uk/en/topics/owner...ryId=4142.html
THIS IS NOT YET AVAILABLE FOR THE F20 (new) 1-SERIES.
You can also get a xenon to LED headlamp retrofit on models where LED headlamps are offered, like the 7-series, 6-series and shortly the 5-series.