| Company | Timeline | Status | |
| Aquaware Systems Limited Secretary • Unreported | 1 Jan 2008←14 Years→28 Jan 2022 | Active | |
| Wallingford Limited Secretary • Unreported | 1 Jan 2008←14 Years→28 Jan 2022 | Active | |
| Howbery Park Estates Limited Secretary • Unreported | 1 Jan 2008←14 Years→28 Jan 2022 | Active | |
| Hydraulics Research Limited Secretary • Unreported | 1 Jan 2008←14 Years→28 Jan 2022 | Active | |
| HR Mardyn Limited Secretary • Unreported | 1 Jan 2008←14 Years→28 Jan 2022 | Active | |
| HR Wallingford Limited Secretary • Unreported | 1 Jan 2008←14 Years→28 Jan 2022 | Active | |
| Wallingford Systems Limited Secretary • Unreported | 1 Jan 2008←14 Years→28 Jan 2022 | Active | |
| HR Wallingford Group Limited Secretary • Unreported | 1 Jan 2008←14 Years→28 Jan 2022 | Active | |
| Wallingford Water Limited Secretary • Unreported | 1 Jan 2007←15 Years→28 Jan 2022 | Active | |
