The Willington excavation report's own chronology dates the successor line its 'Heaton Banks' pointer runs through to 1808-1813, decades after Willington's 1785 construction

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claim-willington-excavators-decline-origin-claim-point-to-heaton-banks records that the excavation report hedges the standard gauge's origin toward "the Kenton and Coxlodge line running west via the Heaton Banks" colliery, where the origin "seem[s] to lie earlier in the 18th century." But the same report's earlier historical section, describing the network surrounding Bigges Main/Willington, states that "The Gosforth and Kenton Waggonway - opened between 1808 and 1813" — decades after the 1785 date the report itself gives for Bigges Main's sinking. The report's own map history compounds the naming problem: an 1811 plan shows a "Coxlodge & Kenton Waggon Way" that had vanished by the 1850s Ordnance Survey, while a separately renamed "Gosforth & Kenton Waggon Way" — described in the same passage as the former Willington line itself, re-named — persisted afterward.

Whichever of these named lines the Phase 5 hedge means by "the Kenton and Coxlodge line," none is dated earlier than Willington in the report's own text. The "seem to lie earlier" origin point the excavators gesture toward must therefore be a still older, undated substrate beneath these named 19th-century lines — see claim-heaton-banks-colliery-closed-1745-no-gauge-recorded for what independent record-keeping says about that substrate. At least three distinct "Heaton"-associated waggonway names recur across the report and Newcastle's Historic Environment Record; keeping them separated matters for any future claim resting on "the Heaton Banks colliery."