The following sorting codes have been used in preparing the database to enable otherwise coherent groups of papers which are now dispersed through the archive to be brought together:
| BLETCOR | Member of Parliament for Bletchingley: correspondence |
| BLETP | Member of Parliament for Bletchingley: papers |
| CAMUCOR | Member of Parliament for Cambridge University: correspondence |
| CAMUP | Member of Parliament for Cambridge University: papers |
| DIPCOR | Diplomatic correspondence |
| DIPP | Diplomatic papers |
| FSECCOR | Foreign Secretary: correspondence |
| FSECP | Foreign Secretary: papers |
| GENCOR | General correspondence |
| GENP | General papers |
| HSECCOR | Home Secretary: correspondence |
| HSECP | Home Secretary: papers |
| MILCOR | Military correspondence |
| MILP | Military papers |
| PMINCOR | Prime Minister: correspondence |
| PMINP | Prime Minister: papers |
| POLCOR | Political correspondence |
| POLP | Political papers |
| ROYCOR | Royal correspondence |
| ROYP | Royal papers |
| SHANCOR | Member of Parliament for South Hampshire: correspondence |
| SHANP | Member of Parliament for South Hampshire: papers |
| TIVCOR | Member of Parliament for Tiverton: correspondence |
| TIVP | Member of Parliament for Tiverton: papers |