try these...
http://www.soundandvisiononline.co.uk/listview/index.asp?strSearch=37px70
They deliver nationally, but you will need to buy a stand also. The stand used on the 42" is the same as the 37" PX model, so that should make finding one slightly easier. You'll need to budget about £100 for the stand, unless you want to wall mount. This model also comes with a pedestal stand as an option, but I think these are rearer than hen's teeth in the shops right now.
http://www.amazon.co.uk/exec/obidos/ASIN/B000QEY7Y0/interactiveda3044-21
Hope this helps..