Those who were behind Headfirst PD were a bit of an enigma to me. They were two friends called James Treadwell and Gareth Boden who were adept at throwing together superb-looking utilities and demos - it now seems that in 1992, Gareth Boden produced this professional little simulation of Waddingtons' board game UNO.
The game uses a very colourful Mode 2 screen and comes complete with a professionally designed loading screen and full instructions in VIEW text file format. It's a PD package at its best where the disk contains slighty different versions for the Electron, BBC B and Master series - each carefully optimised for the particular machine - but where the correct version is automatically chosen by the loader program. Elk owners whose disk-systems set PAGE to either 1900 are catered for and so too are persons with a Master RAM Board operating. Although the program is exactly the same across all formats, certain sections of code differ so that there are no problems with memory or graphic clashes across the machines.
Were it not unofficial [And produced about seven years too late! - Ed], this would've been one of the most professional conversions of a card game available. Selling it unlicensed for profit however wouldn't please Waddingtons who own the copyright but as a PD demonstration of Gareth Boden's programming talents, as mentioned, it's yet another superb piece of software. Recommended.