Winston, it is you who are complicating the issue. The OP Specifically stated in his first post
it would better better for everyone if you couldread and understand the requirement before driving off in a different direction.
@Noeggspurt do as suggested above. Remove the junction box and fit a single 13amp socket. Then you can plug it straight in without butchering the plug.
Oh yes, and ignore this further misdirection
That guidance is specifically About connecting high current devices to ring final circuits. The ‘cooker’ circuit is not on a ring final. It is perfectly ok to plug it in.
While we are talking about spelling what is this guid
ence you refer to?
Not perfect at all are we?
Hope that Winston remembers to take his medication this morning.