Video:
https://www.youtube.com/watch?v=ivVpxzXzByA
There are quite a few things going on here, the first and most obvious point is that "School term time" is not a permitted expression according to the TSRGD 2016 (I did actually check) and the signage therefore fails the LATOR 18 test.
It's handy you've made a couple of videos as we can use them to prove if they actually look at the representations or not.
I will PM you some links to put in the representation, I've re-uploaded your videos to youtube and if you give them the links I'll PM you, we can use the view count to confirm whether they've looked at them or not (obviously do not click on the links I PM you as we want the view count to remain at zero). If they don't click on them, we can then prove they've failed to consider all of the evidence. If they say in the rejection that they've considered all the evidence, we've got them for lying as well.
Dear London Borough of Merton,
I challenge liability for PCN MT87232790 on the basis that the alleged contravention did not occur.
The signs directly at the entrance to Monkleigh Road are very hard to read and they include unauthorised wording, there is nothing in the Traffic Signs Regulations 2016 which authorises a plate which states "School term time", possibly because the driving test does not include a questionnaire as to when school term times are.
There is a sign on the approach to the junction but this sign is not an advance warning sign authorised by Schedule 12 to the Traffic Signs Regulations and it appears to be another unauthorised sign of the authority's own invention.
On the whole the sign does not therefore discharge the authority's duties under regulation 18 of The Local Authorities' Traffic Orders (Procedure) (England and Wales) Regulations 1996, to illustrate this point I am providing two videos which illustrate my approach to the road, you can view these are LINK1 and LINK2
In light of the above the alleged contravention did not occur and the PCN must be cancelled.
Yours faithfully,
Send that online and keep a screenshot of the confirmation page. In the meantime I've also requested the traffic order.