Frequency of pat testing: Inspection Test Frequency

Every row is a verbatim sentence read from the named source's own page through the estate's fetch service on the date shown, hash-pinned to the stored read (the sha of the page's visible text; the raw page is mirrored to R2).

2 of the 22 named sources that could be read published a usable figure; 20 published none and are recorded as not published, never filled in; 1 could not be read (blocked, dead or unreachable) and count nowhere.

The headline figures (median, minimum, maximum, quartiles) are over ONE figure per source in year (a source's median where its page yielded several accepted sentences), so N counts sources, never sentences; 37 candidate sentence(s) were refused by a reviewer with the reason recorded.

Derivation as chartered: Two intervals that nobody publishes as one answer, each labelled with whether it is LAW or GUIDANCE.

For portable appliances: the initial interval by equipment class and environment (hand-held against stationary, office against construction site against equipment hire), from HSE's own guidance - which says explicitly that no fixed interval is required by law and that the suggested tables are suggestions.

For fixed installations: the maximum period between inspections by tenure and premises type (private rented 5 years by statute in all four nations, owner-occupied 10 years by guidance, HMO, commercial, industrial, caravan park, swimming pool), from the statute where a statute sets it and from BS 7671 / IET guidance where it does not.

The derivation is the gap: how often the internet's stated interval is a guidance figure being repeated as if it were law.

37 candidate sentences on these pages were refused by a reviewer; each refusal and its reason is recorded in the review ledger.