A bit of web browsing (what else are public holidays for?) turns up a few references to this
product under a variety of names.
I've found one site
http://www.pendec.dk/weatherstation.htm that has a program for reading the weather station data on a Linux system which is just what I need.
Now the wait for delivery
Edit: Here's a PDF manual for the weather station for those interested
http://www.wsplc.com/pdf/wwsmanual.pdf