Tree preservation zone

There is a problem

tree-preservation-order column must match the reference field in the tree preservation order dataset

reference: 8/GOD W6
name: On the south side of Tilburstowhill common between old Tilburstow Road and the London-Eastbourne A22 road in the parish of Godstone
tree-preservation-order: undefined
8/GOD
tree-preservation-zone-type: woodland
geometry: MULTIPOLYGON (((-0.054400 51.236491,-0.055606 51.236157,-0.057166 51.235802,-0.057289 51.234935,-0.057307 51.234935,-0.057338 51.235079,-0.057404 51.235236,-0.057451 51.235420,-0.057588 51.235707,-0.057878 51.235725,-0.058412 51.235568,-0.059232 51.235228,-0.059464 51.234906,-0.059656 51.234701,-0.059641 51.234636,-0.059671 51.234337,-0.059863 51.234119,-0.060323 51.234188,-0.060503 51.234229,-0.060778 51.234171,-0.060983 51.233994,-0.061395 51.233766,-0.061378 51.233284,-0.061154 51.233398,-0.061027 51.233370,-0.058568 51.234288,-0.058151 51.234424,-0.057594 51.234636,-0.057286 51.234794,-0.057202 51.234963,-0.056699 51.235071,-0.056577 51.235134,-0.056317 51.235227,-0.055656 51.235515,-0.055313 51.235653,-0.054800 51.235892,-0.054741 51.235995,-0.054774 51.236074,-0.054770 51.236159,-0.054741 51.236210,-0.054694 51.236236,-0.054620 51.236260,-0.054592 51.236286,-0.054414 51.236393,-0.054394 51.236413,-0.054400 51.236491)))
point: POINT (-0.058057 51.234966)
notes
organisation
entry-date: 1951-04-20
start-date: 1951-04-20
end-date

Your dataset is missing the tree-preservation-order column.

The Tree preservation zone guidance explains how to fix the issue:

The reference for the tree preservation order that covers this zone.