There is a common belief in Barnet that school zig zags are not enforced during school holidays. Traffic wardens do walk straight past (unless there is also a single yellow which is operative) but the cameras are still on.
Having read the above report Mr Mustard found that the school was closed from 1 to 17 April. He then checked the Barnet Open data moving traffic dashboard for that period and found that cameras had issued 138 PCN of which 7 were at Hale Drive. So you must be careful. Here are the listed camera locations but it is best to look up before you stop on the zig zags
CCTV can easily be moved so don't rely on this list, look up the poles for cameras, possibly like these
If in doubt, stay off the zig-zags.
The PCN which went to the tribunal is a pure a case of revenue raising as you can find but the adjudicator's hands were tied as strictly a contravention had occurred and his job is to apply the law - he evidently wasn't impressed with the council though.