Living-knowledge lineage · Case 2
Sieve and riddle making returns from extinction
A public-source record of how a traditional making practice moved from a reported last maker, through an extinction classification, into renewed practice — while the actual transfer of tacit skill remains only partly visible.
Critically endangered — Heritage Crafts
Partially reconstructed
0 main-income · 1 side-income · 1 trainee
Not a craft manual or practitioner endorsement
The practice crossed an extinction boundary. The skill-transfer path is less clear.
In 2009, The Guardian reported from Mike Turnock's workshop and described him, as far as he knew, as the last person in Britain still making traditional handmade sieves and riddles. Heritage Crafts later says Turnock retired in 2010, the craft was listed extinct in its first Red List in 2017, and two new makers had revived it by March 2019.
Heritage Crafts' current entry identifies Steve Overthrow and Colin Davies as the revival/current-practice makers and reports that Red List and Countryfile exposure were part of their pathways into making. That is evidence about attention. It does not by itself show how the tacit skill crossed from one person or generation to another.
For Overthrow specifically, later public sources narrow the route further: a 2019 Heritage Crafts report records advice and tuition from Mike Turnock plus product development/refining, while published practitioner interviews describe research, trial-and-error and Turnock's help. These are reported learning components, not a complete or strictly ordered reconstruction of the transfer.
The visible lineage
In a published Homo Faber interview, Steve Overthrow reports learning partly from Mike Turnock and receiving knowledge he could not find through research. A 2019 Heritage Crafts Red List report separately records Turnock advice/tuition and product development/refining, while a 2023 Gardens Illustrated interview describes research, repeated trial-and-error and Turnock's help without establishing one complete linear chronology. This narrows the learning route without turning public reporting into observation of teaching or a process manual.
- 2009 — reported last makerJon Henley's Guardian feature records Mike Turnock at Hill & Sons, his family/business history, his working process and his hope of finding someone to train before retirement.
- 2010 — retirementThe current Heritage Crafts page says Turnock retired in 2010.
- 2017 — listed extinctHeritage Crafts says the first Red List classified sieve and riddle making as extinct.
- 2018–2019 — revivalThe current page describes the craft as extinct until 2018; Heritage Crafts reported in March 2019 that two new makers had revived it and were beginning commercial production.
- Current — living but fragileHeritage Crafts now classifies the craft as critically endangered and reports no main-income professional, one side-income professional and one trainee.
What was passed on, and what was learned anew?
- Exactly what knowledge passed through the Turnock-to-Overthrow learning route reported in the Homo Faber interview, and what other transmission occurred?
- For Overthrow, what were the timing, relative contribution, exact tacit content and completeness of the reported research, trial-and-error/product-development and Turnock advice/tuition routes?
- For Colin Davies, what learning route followed the reported Countryfile / Red List attention pathway?
- Which parts of the older Hill & Sons practice survive unchanged, and which have been adapted?
- Did any materially important tacit knowledge disappear during the extinction interval?
- How complete is the current practitioner count, and how durable is the present training route?
Sources are not all independent
The 2009 Guardian feature is an independent publication based on reporting from Turnock's workshop. The 2019 Red List announcement, the 2019 Red List report and the current craft page belong to one Heritage Crafts institutional evidence family rather than counting as three independent witnesses.
The current Heritage Crafts page cites the Guardian feature. Different publishers therefore do not establish independent corroboration for overlapping historical claims; the citation alone does not show which claims depend on that feature.
The page names a 2025 Red List review cycle. Our 2026 source-read date is not a new practitioner census.
Correction, 19 September 2026: a Heritage Crafts 2019 report and a 2023 Gardens Illustrated interview narrow the Overthrow route to reported components including research, trial-and-error/product development and Turnock advice/tuition; exact sequence and overlap remain unresolved. Exact tacit content, timing, relative contribution and completeness remain unknown. Homo Faber and Gardens Illustrated are separate publishers but both carry practitioner-reported learning accounts; multiple interviews are not automatically independent witnesses to the underlying teaching. No practitioner contact or endorsement is claimed.
The current Heritage Crafts page also links to a practitioner website for process details. This research aperture did not successfully retrieve that site on 16 September 2026. That failed fetch is recorded as an access limitation, not evidence that the site has disappeared.
Heritage Crafts owns the craft-status problem
Heritage Crafts maintains the Red List, consults practitioners and records viability, training and safeguarding needs. The Human Record does not compete with that work or independently classify the craft.
The narrower THR role here is source lineage: what was reported before the break, how extinction and revival were recorded, how public attention is reported to have reached later makers, and what those records still cannot tell us about actual skill transmission.
Public reporting is not permission to extract a practice
The named practitioners have not been contacted for this record. Their appearance in public sources does not imply participation or endorsement.
This page does not reproduce a detailed craft manual, private correspondence, unpublished teaching material or restricted knowledge. Any future attempt to record workshop practice, tools, voice, video or practitioner-specific tacit knowledge would require a separate permission decision.
Why this record matters
PERSON → PRACTICE → BREAK → PUBLIC RECORD OF LOSS → ATTENTION → NEW PRACTITIONERS → NEW TRAINING → STILL FRAGILE
This is the first Human Record case that touches living knowledge. Its main result is a limit: a record can preserve evidence about transmission, reconstruction and renewed learning, but it cannot become the hands, judgement, feedback and repeated practice through which a craft remains alive.
Go deeper
This is a public-source lineage record. It does not preserve the craft itself or imply endorsement by the practitioners named in its sources.
View basis: aligned 19 September 2026 to record version 0.1.3, cases/sieve-riddle-revival.md@15c5dd8… and cases/sieve-riddle-revival.json@4495a5d…. If either source blob changes, this human summary must be reviewed before its freshness is assumed. Blob identity establishes bytes, not truth.