OK, another quick update...
My GF's Dad gave me a hand to remove the bumper so I could crack on with changing the lights over - which turned into a total PITA since it was raining!!
As you can see, a simple headlight change is not quite so simple due to BMW's design!!!
The end result is that the 1M lights are in, the bulbs and ballasts are swapped over, and I just need to find an auto-electrician to tap the LED eyebrows into the side lights for me....
'1M' BiXenon by
jamesnathanjolly, on Flickr
E81 now with added brow by
jamesnathanjolly, on Flickr
1M xenons by
jamesnathanjolly, on Flickr
1M Xenons (2) by
jamesnathanjolly, on Flickr