Hi; in my changeset 171318302 I reverted the changes marking Coldhams Lane as closed (here and changeset 170726076), in line with guidelines about temporary closures/events at https://wiki.openstreetmap.org/wiki/Good_practice#Don.27t_map_temporary_events_and_temporary_features and https://wiki.openstreetmap.org/wiki/Key:construction (which says to only tag closures of the order of 6-9 months), for the benefit of offline users and other uses of old copies of OSM data.
While the current ~6-week closure is frustrating, especially now it's been extended to Sep 12, on top of with previous long closures in the past year, it doesn't meet that threshold.