Office of Continuity Verification
Historical Availability History
Historical availability measures the proportion of completed events that remained available for public, educational, administrative, and commemorative use during the reporting period. It does not measure accuracy, which is reported separately and is not a percentage.
Reporting period 2026
| Month | Availability | Note |
|---|---|---|
| January | 99.9997% | Routine verification. No variance reported. |
| February | 99.9997% | Routine verification. One household record reconciled. |
| March | 99.9997% | Selected childhoods loaded slowly during a scheduled index rebuild. |
| April | 99.9997% | Routine verification. |
| May | 99.9997% | Causes available. Certain effects delayed pending review. |
| June | 99.9997% | Routine verification. 1893 placed in read-only status. |
| July | 99.9997% | Public recollection clustering reported. Availability unaffected. |
| August | 99.9997% | Routine verification. |
| September | 99.9997% | Routine verification. One archive box reweighed. |
| October | 99.9997% | Routine verification. |
| November | 99.9997% | Routine verification. |
| December | 99.9997% | Annual confirmation completed. Every year occurred in approved order. |
Method
Availability is confirmed daily. A completed event is counted as available if it can be cited, taught, commemorated, and relied upon. An event under interpretive dispute remains available, because the dispute concerns wording rather than occurrence.
The figure has been stable at 99.9997 percent throughout the reporting period and for each prior period on record. The Bureau considers stability at this level to be evidence that the programme is working.
The remaining proportion
The Bureau does not publish a breakdown of the unavailable proportion. Requests for a breakdown are retained.
Prior periods
Reporting for periods before 2026 is held by the Archive. Figures published under a superseded revision of the Current Approved Past remain accurate as published and are not restated.
Related
Current status, Scheduled maintenance of prior events, Transparency and oversight.
The past remains available.