The
Evans next to the Metro Centre is your best bet for a look at the Raleigh, they dont always have the biggest selection of road bikes in but it's your best chance of seeing the Raleigh I'd think.
The other option is
EBC in Byker, they always have a good selection of bikes on display that you can test out properly, staff have always been good with me and they will price match pretty much anything you can find online.
If you want a bit more of an LBS feel try KB on Newburn High Street, a couple of the local clubs recommend them and although I've never been I'm told the have a really good selection of bikes on show and the staff are very k
nowledgeable http://www.kbcycles.com/index.php
Decathlon is a bit of a trek if you want to see the bike in store, closest one is probably Sheffield or maybe Edinburgh.