Hi - in this changeset you have changed relation 8495916 from network=ncn to network=rcn. This is wrong. This is a regional route (numbers on a blue background) and as such is tagged with RCN, not a national route (numbers on a red background) tagged with NCN. NCN 51 runs from Oxford to Cambridge and into East Anglia, not in Devon.

Could you fix this change and any other similar ones you've made? Thank you.