ID Numbers
All of the individuals in the databases are assigned a unique ID which is in two parts.
The first part consists of letters which indicate the branch. The second part is a number assigned to the individual. Numbers above 1000, are unique but numbers below 1000 may be duplicated between branches.
| Early Branches | |
| M | Main |
| MB | Boulston |
| MF | French |
| MG | Gawdy Hall |
| ML | Llanstinan |
| MO | Oxon |
| MR | Rathcoffey |
| MS | Somerset |
| MST | Stonehall |
| MW | Wiston |
| TBN | Blackhall & Newhall |
| TE | Haverfordwest |
| Modern Branches | |
| ASH | Ashton |
| ATH | Athlone |
| B | Barnsley |
| BH | Hull |
| G | Glossop |
| HX | Halifax |
| L | Australia & New Zealand branch |
| O | Coachmakers |
| R | Wales |
| TC | Colclough |
| TD | Devon |
| TK | Keighley |
| TM | Malahide |
| TW | Enniskerry |
| UA | New Orleans branch |
| UB, UC | USA branches |
| W | Wigan |
| X | unknown - Stray |