Some more info on Soccer Kid in Acorn User Nov 96 p81:
The article then describes the game and prints Shaun's personal eMail address.A gauntlet has been thrown down to any Acorn games programmers stalwart enough to attempt the challenge. Shaun Hollingsworth of Krisalis Software has announced to the Internet at large that the company is willing to allow the release of Soccer Kid as a shareware title - providing an individual or a team of programmers steps forward and offers to code it. Shaun explains that Krisalis is performing this gesture as a sign of good will in return for the support that the Acorn community has given in the past. This is an excellent opportunity for any budding coders out there to get into the scene - the source code is available for both the Amiga and 3DO versions of the game, and perhaps most attractive of all for the first-time programmers, you don't have to think of a storyline.
I contacted Shaun in 2011 or 2012 and he was adamant that all Krisalis source code was lost.