http://www.nokiaretail.co.uk/customerServices/about.htm

"Nokia Retail is operated by Mobile Phones Direct Ltd, Nokia UK's branded retail store partner."

The online shop at nokiaretail.co.uk is run by MPD.
The bricks & mortar stores at some locations are run by MPD.

The online shop at nokia.co.uk is run by Nokia UK.
The bricks & mortar stores at some locations are run by Nokia UK.

They clearly have a branding agreement as the graphics as virtually identical, and Nokia Retail stores look... well, a lot like Nokia UK stores :-)

But they aren't the same company, and don't have the same shipping arrangement.

Hope that clears things up.