Hey Bungle, I assume you are in the UK since your link is to a UK site.
Here is HP's list of all the 6915 variations, the two on the site are the normal and "top value" English ones. I have no idea what is included in "top value" but that is presumably why that one costs a bit more.
HP iPAQ hw6915 Mobile Messenger – GSM/GPRS/EDGE, Wi-Fi, Bluetooth, GPS, w/ camera
FA736AA#ABU – UK English
FA736AA#ABB – Euro English
FA736AA#ABF – French
FA736AA#ABZ – Italian
FA736AA#ABE – Spanish
FA736AA#ABD – German
FA736AA#ACB – Russian
FA736AA#ABV – Arabic
FA736AA#ABH – Dutch
FA736AA#ABS – Swedish
FA736AA#ABV – Arabic
FA736AA#ABN – Norwegian
FA736AT#ABU – UK English (Top Value)
FA736AT#ABB – Euro English (Top Value)
FA736AT#ABF – French (Top Value)
FA736AT#ABZ – Italian (Top Value)
FA736AT#ABE – Spanish (Top Value)
FA736AT#ABD – German (Top Value)
Oh, for anyone interested, here's the link to the HP spec for all the 6900 series:
http://h18000.www1.hp.com/products/q...12352_div.HTML