Xenons in europe are avaiable week 22 end of may. Im sure the UK will follow shortly after.
I think i have typed this about a million times on just about every forum going lol. Must have missed this one lol.

Its the same problem they have had with the scirocco its a supply issue.
Golf GTI with completely redesigned bi-xenon headlights, including dynamic curve lighting. The headlights swivel through a steering radius of up to 13 degrees to the outside and seven degrees to the inside. The styling of the headlights closely matches the GTI’s sporty character. The interior dual modules (xenon outboard, parking light / turn signals inboard) each have a chrome pod through which a very impressive visual image projects.
Don't expect them to be a cheap option though as they are £850 from SEAT so expect VW to add there cut ontop for there 'prestige' VW badge pricing.