Tree preservation zone

There is a problem

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

reference: TPO175
name: In OS 305, 307 and 357
tree-preservation-order: undefined
Crowle Order 1970
tree-preservation-zone-type: group
geometry: MULTIPOLYGON (((-0.828188 53.598196,-0.828116 53.598176,-0.828028 53.598134,-0.827915 53.598188,-0.827425 53.597975,-0.827358 53.598006,-0.827508 53.598160,-0.827645 53.598203,-0.827743 53.598262,-0.827643 53.598371,-0.827622 53.598419,-0.827601 53.598435,-0.827534 53.598537,-0.827531 53.598734,-0.827517 53.598762,-0.827497 53.598773,-0.827389 53.598908,-0.827369 53.599006,-0.827307 53.599153,-0.827157 53.599388,-0.827085 53.599474,-0.827003 53.599554,-0.826941 53.599592,-0.826911 53.599596,-0.826887 53.599615,-0.826886 53.599641,-0.826897 53.599656,-0.826959 53.599681,-0.827080 53.599649,-0.827272 53.599493,-0.827304 53.599454,-0.827411 53.599269,-0.827456 53.599224,-0.827518 53.599132,-0.827652 53.598969,-0.827817 53.598863,-0.827870 53.598797,-0.827944 53.598663,-0.827971 53.598573,-0.828026 53.598439,-0.828089 53.598312,-0.828188 53.598196)))
point: POINT (-0.827619 53.598721)
notes
organisation
entry-date: 1970-10-22
start-date: 1970-04-28
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.