ok... I actually have very good news for everyone! I just got off the phone to Nokiaretail (information for contact can be found in their website... nokiaretail.co.uk) and asked about the confusion between nokia.co.uk and nokiaretail.co.uk. I got told that the date we got given (3rd of December) could and probably will be pulled back because they are waiting for stock now. I also got told that nokiaretail and nokia.co.uk or nokia whatever is all part of NOKIA so they all will be stocking same time.
The guy said to me that there is tooooo much interest on the phone but dont be impatient, he said, people who ordered already nomatter weather it is from nokia.co.uk or from nokiaretail probably receive their n900's same time.
Actual words were "if you hear anyone owning the N900, you will probably receive your within 24hours.

I hope this clears some confusions and puts a good smile on peoples faces... specially ones that ordered from Nokia Retail or MPD

(They ARE waiting for stock anytime and London will get it first, then Reading and Manchester...)