Let's see if I can bring in something useful:
United Kingdom DVD's:
·
http://www.dc-dvd.co.uk
·
http://www.amazon.co.uk
United Kingdom Merchandise:
·
http://www.otaku.co.uk
DC-DVD is slightly pricey though, so Amazon.co.uk is your best bet. However, they don't do as much anime... it all depends on what series you want to buy ^^;;