Cardcaptors was an abomination put forth by Nelvana as a re-edit, re-dub, and all around **** up of Cardcaptor Sakura. Thankfully Nelvana's "Cardcaptors" project was deep-sixed after the first run. The original series, Cardcaptor Sakura, should be in wide distribution in Europe already.
The DNAngel anime is currently available is the UK.
Air just started in Japan in manga form last September and the series is also currently running in Japan. It has not been licensed for North America or Europe yet, so unless you can find some scanlations and/or fansubs to download, you're going to be out of luck for quite a while.
Tsubasa Reservoir Chronicle the anime has not been licensed yet and therefore only currently available outside of Japan as a fansub download. The manga has been available in the UK since at least the beginning of the year.
You can easily find out release dates, availability, and prices at amazon.co.uk. From what I've heard Amazon UK often runs some good sales and if it's available in the UK, they'll have it.