Well i feel like a massive douche for moaning on the forum but i guess 'coz im not mechanically minded i think there must be something im doing wrong.
So thank you to everyone who posted
Happily i have rectified the problem, quite oddly i may add.
So through desperation i had the lights off held the main beam on then flicked the headlights on manually, hey presto both xenons flick into life. Now work as normal, bloody gremlins.