I have read that these are reconmended http://www.powerbulbs.com/ and http://www.autobulbsdirect.co.uk/home.php
I'm not sure, but you may get a discount from Powerbulbs from being a member on here.
Remember there are legal issues surrounding retro fitting HID/Xenon kits. If you just want standard bulbs then Halfrauds or a local motor factor is your best bet.
If you don't know what you are doing I would suggest going to halfords and getting them to fit the bulb. The nearside one looks a pain in the bottom to do.
Halfords make a big thing of being able to fit stuff for you. Go use it.
Conks
One of the bulbs went in mine (N/S) and I really couldn't be arsed to get my hands dirty so I was willing to pay Halfords to fit in for me, but they wouldn't touch it, so I had to do it myself in the end anyway.
Had to remove part of the battery cover for the extra room, which Halfords wouldn't do.
That's unusual, which Halfords was that?
it just depends on managers preference, whether the guy fitting could spend his time better somewhere else..
As for my store (In Newbury, by the way- names Lawrence ) i often find myself taking apart wiper assemblies to get to awkward batteries, and we wouldn't turn away an Ibiza in ANY case- their comparatively easy looking at a lot of cars we get