dhaider and gb,
Dhaider, I don't know what to tell you about locating the SilverStar ULTRA H7 bulbs in the UK. However, I did go the website you listed above, and it appears that their closest bulb to the AMERICAN SilverStar ULTRA H7 is the Osram H7 12 volt, 55 watt, "Night Breaker +90% Bulbs".
Also, I can't comment about the forum post that stated low beam = 9006 su/2 and high beam = 9005 su/2. Could it be that European EOS's have DIFFERENT headlamp bulbs vs. North American EOS's?!
I know for a fact, and WITHOUT A DOUBT, that NORTH AMERICAN EOS's have (1) H7 bulb in each LOW beam position and (1) H7 bulb in each HIGH beam position.
And gb, the bulbs are really easy to install......clearly written, easy to follow instructions are in your owner's manual. Once familiar with the instructions, it should take you about 10-15 minutes to do BOTH the low beam AND high beam bulbs.