In reply to TobyA:
> ..... there must be some "open source" versions kicking around by now. >
Just a warning, when I went to Pontesford earlier this year I hunted around online for the mythical Pontesford PDF and having apparently found it, tried to download it only to inadvertantly download a trojan horse which downloaded a stack of other unwanted dodgy programmes and swamped webpages with unwanted adverts.
Took me a week to get rid of that bugger, just be careful what you download.