Pennine Software ceased trading many years ago and even then had no products to sell and no links to exchange. I have no desire to generate traffic on this server by being accessible to search engines. The public facing server at WWW.pennine.demon.co.uk was searchable and served by a high-connectivity server at my ISP, but they seem to have discontinued this service without having the courtesy to warn me. Demon was an excellent ISP when they first started in hte very early days of dial-up but they are not one I'd recommend today.
There is a rather more useful public server at waddingtons.info (although some host names in that domain also point here). On my local server, URLs are not expected to be forever unchanging and indeed, are likely to be deliberately changed in response to traffic seen as excessive or undesirable. Please don't link to anything on this site without asking the webmaster, so he can let you know if your link will become broken if he allows it. The server sits on the end of ADSL on a very long and old phone line, which has several faults (althogh BT did fix a few) and is very slow indeed at times (under 200kb/s recently (2017)). This, server traffic will impact the usability of those links for the users who are paying for them. So if there is something here that you need, you will find that you have been given the URL for it. Conversely, if you are just surfing and don't know the URL for something specific on the site, it is almost certain that there is nothing here of any interest to you.
Finally, I do check logs when there is a lot of traffic, and I do render the site inaccessible to some users - for instance, a number of search engines are blocked (including yahoo and yandex) for failing to respect my robots.txt file asking that the site not be indexed by search engines. Large blocks of IP addresses in China, Russia, Taiwan and several other places are also blocked completely by our firewall. There is 2.5 Tb of filespace here (not quite full) and if even one search engine tried to index that lot even once a decade, my bandwidth would not cope. Sites downloading the same material (especially big files) multiple times are also likely to be blocked. Sorry if that all sounds terribly fascist, but keeping the majority of casual traffic off the site is the only way that I can make the large amount of material here available to the tiny audience to whom it is of genuine interest. Thanks.