Couldn't whoever did this have restripped the wire and just made the red shorter for the Schuko's ground terminal?
The black looks too long to have been just taken from a BS1363 plug and reconnected "as is." Mind you, I've seen some people wire BS1363 with the neutral looped halfway up the side toward the earth and then back down again, all jammed in tightly so the cover fits!
Just for fun I test fitted a BS 1363 plug two days ago - perfect fit, no need for squeezing. The black could be a little shorter, but it definitely isn't too long to fit. The red is extremely short though, barely extends into the terminal.
