Eberhard,
That is very useful - thanks! Obviously I'll have to look into this more, but it doesn't appear to be too costly so may suit me well. I just hope I can get it shipped to the UK as if I can't it does cause me a slight issue!
That being said, the info is much appreciated!
Martin
[Edit] Having looked more into this I'm afraid that it probably won't work with what I had in mind - I intend to use accelerometers to determine the mouse movement (tilting most likely). However if you know of a way that I can make this work please let me know!