| Label: | BMG UK & Ireland SW12P2 |
| Genre: | Electronic |
| Style: | Progressive House, Trance |
| Format: | Vinyl (12" , Promo) |
| A | When I Lost You (K-Klass Ultimate Vocal Mix) » Remix: K-Klass | |
| B1 | When I Lost You (K-Klass Pharmacy Dub Mix) » Remix: K-Klass | |
| B2 | When I Lost You (Flatline's Whatever Next? Monkey Tennis Vocal Mix) » Remix: Flatline |
| Label: | RCA 74321 96254 2 |
| Genre: | Electronic, Pop |
| Style: | House, Brit Pop |
| Format: | CD (Maxi-Single , Enhanced) |
| 1 | When I Lost You | 3:25 |
| 2 | Are You Ready For Love » Producer [Additional], Keyboards: Julian Gallagher, Richard 'Biff' Stannard » Producer, Keyboards: Matt Rowe » Recorded By: Ric Simpson » Written By: S. Hole » Written-By: D. Andrew | 3:59 |
| 3 | When I Lost You (M*A*S*H Master Mix) » Remix: M*A*S*H » Remix [Credited To], Producer [All Instrumentation Production]: Andy Lee, Pete Lee | 6:26 |
| 4 | When I Lost You (K-Klass Ultimate Vocal Mix) » Engineer: Andrew Williams » Remix, Producer [Additional]: K-Klass | 7:39 |
| Video | When I Lost You | 3:29 |
| Label: | RCA 74321965952 |
| Genre: | Pop |
| Style: | Vocal |
| Format: | CD (Single , Enhanced) |
| 1 | When I Lost You | |
| 2 | Are You Ready For Love | |
| 3 | When I Lost You (M*A*S*H Master Mix) » Remix: Andy Lee, Pete Lee | |
| Video | When I Lost You |
| Label: | RCA SWCDP1 |
| Genre: | Electronic, Pop |
| Style: | House, Brit Pop |
| Format: | CD (Single , Promo) |
| 1 | When I Lost You | 3:27 |
| Label: | BMG UK & Ireland SW12P1 |
| Genre: | Electronic |
| Style: | Progressive House, Trance |
| Format: | 2 Vinyl (12" , Promo) |
| A | When I Lost You (M*A*S*H Master Mix) » Remix: M*A*S*H | |
| B1 | When I Lost You (Bimbo Jones Mix) » Remix: Bimbo Jones | |
| B2 | When I Lost You (Radio Version) | |
| C | When I Lost You (Robbie Rivera Vocal Mix) » Remix: Robbie Rivera | |
| D | When I Lost You (M*A*S*H Deep Club Mix) » Remix: M*A*S*H |
| Label: | RCA 74321965954 |
| Genre: | Electronic, Pop |
| Style: | House, Brit Pop |
| Format: | Cassette (Single) |
| A1 | When I Lost You | 3:25 |
| A2 | Are You Ready For Love | 3:59 |
| B1 | When I Lost You | 3:25 |
| B2 | Are You Ready For Love | 3:59 |
| Label: | RCA 74321965951 |
| Genre: | Electronic, Pop |
| Style: | Progressive House, Trance |
| Format: | Vinyl (12" , Single) |
| A | When I Lost You (K-Klass Ultimate Vocal Mix) » Engineer: Andrew Williams » Remix, Producer [Additional]: K-Klass | |
| B | When I Lost You (Flatline's Whatever Next?... Monkey Tennis Vocal Mix) » Remix, Producer [Additional]: Martin Cartledge, Tim Cartwright |