| 16718 | 4 on a Row | ZX-Spectrum 48K | English |
| 40233 | 4-Stroke Petrol Engine | ZX-Spectrum 48K | English |
| 2000012 | 40 Best Machine Code Routines for the ZX Spectrum | - | English |
| 2001684 | 40 Best Machine Code Routines for the ZX Spectrum - 4th Edition | - | English |
| 40041 | 40 Character Print | ZX-Spectrum 48K | English |
| 15555 | 40 Characters Per Line | ZX-Spectrum 16K | English |
| 25529 | 40 Education Games | ZX-Spectrum 48K | English |
| 2000013 | 40 Educational Games for the Spectrum | - | English |
| 2001462 | 40 Great Flight Simulator Adventures | - | English |
| 2001463 | 40 More Great Flight Simulator Adventures | - | English |
| 11449 | 40 Sermon Outlines for Busy Preachers | ZX-Spectrum 48K | English |
| 25546 | 40x24 Screen | ZX-Spectrum 48K | English |
| 24084 | 42 | ZX-Spectrum 48K | English |
| 26602 | 42 Characters | ZX-Spectrum 48K | English |
| 16941 | 42 Columns | ZX-Spectrum 16K | English |
| 23788 | 42 Text Viewer | ZX-Spectrum 48K | English |
| 2000014 | 44 Dynamic ZX81 Games | - | English |
| 28875 | 4472 Flying Scotsman | ZX81 16K | English |
| 40254 | 4500 Baud Cassette Interface | ZX-Spectrum 48K | English |
| 7878 | 48/80 FORTH | ZX-Spectrum 48K | English |