have skimmed the thread and dont get why op is deserving of many of the comments posted here.
yes, i get the points being made about causing obstruction, children being injured and worse. of course there is justifiable anger and upset about that....
HOWEVER
the op, (whether its a wind-up or not) said car was parked on double yellow lines. to elaborate on my earlier post, cars can to stop for passengers to hoard and alight. they can also:
park for up to 40 mins to load/unload
park for up to 3 hours (blue badge displayed)
the warden (civil enforcement officer) will usually observe the vehicle for at least 5 minutes to see if an exemption applies (as above).
if the op, or anyone else simply parks, takes child to school gate and returns, that is allowed. (i accept that the op did more than this, hence the 6 mins shown on her ticket.)
i, for one find it frustrating that parents park so selfishly outside school etc, but i dont think that lots of comments here were justified. zig-zags, loading bans (yellow lines with vertical lines on kerb) are in place at places and at times that are deemed to have particularly high traffic stress. this appears to be the type of restriction that many posts here relate to. i would share that anger too. but really, that doesnt apply in the op's case, so can we just lay off? please? and play nicely?