Why would anyone want to store the charging cable, or anything else for that matter under the bonnet.
It is far harder to open than the boot and the cable takes up so little space.
if anything happens, MG could try and void any warranty.
Has the car been tested under NCAP conditions in a front collision?
If that comes through the dashboard and kills or seriously mames you or your passsenger, how are you going to feel?
What have you told your insurance company; that you have bought a plastic box off a bloke on a car forum and stuck it under your bonnet for added storage? Good luck getting them to accept that, or a claim if it comes to it.
Depends if the boot is full of all the stuff you put into one of those, when going on vacation for example.
The other points i fully agree on, the NCAP test now has strict tests for pedestrian safety, electric cars usually get good "grades" for the test where a "head" impacts the bonnet, because the bonnet is able to flex a lot, because there is nothing underneath, normally.
Now there is suddenly a semi rigid structure, that will alter the bonnets ability to flex if someone smashes their head into it.
Also...Even if this insert has nothing to do with it, in reality, if the car ever catches fire in the "engine compartment" the insurance might claim it was this modification that lead to the fire and if you have it in, and the car breaks down, and you have it towed to MG, and the for example determine that the fault lies in one of the boxes beneath the insert, they might claim it failed because of heat not being able to escape.
As said, it might not be correct that this is what caused it, but any chance they have to get away with billing you for an expensive electronics box, compared to doing it on the warranty, they will jump at.
IF i had bought one of these i would CERTAINLY, take it out, whenever the car was to be serviced, just to be on the safe side, with regards to warranty claims and whatnot.