I see the Japanese have been very dispassionately pragmatic . They have given the UK a Trade deal , full text. 6 weeks to agree or forget it.
It is rather the EU-JPN deal with good bits for UK stripped out.
Liz truss and Raab are in trouble here.
Japanese don't say "6 weeks" .

and not mean it.
As business people and negotiators, as a people, they are courteous, honest to the point of abrupt.
They are deeply hurt by disingenuous behaviour and dislike being misled (as they have been by Britgov).
They remain, at all times, pragmatic.
They see a weak UK.

They value EU -JPN as a paramount European continent deal.
They value the Pacific AESEAN as more important, slightly.
They see UK-JPN as a minor deal if UK is no longer a gateway to Europe.
Fin

Japan has become increasingly exasperated with britgov "playing games " and has referred back to its clear and concise missive much as EU finds itself constantly having to refer back to UK promises in its political declaration. https://www.mofa.go.jp/files/000185466.pdf

P.S. to head-off the usual " link ?" questions.
Japan is very well known for conducting business quietly, efficiently and dislikes doing it under a spotlight as people become too important and it hinders negotiation.
There are a couple of journalists based well ) commenting

For context. (as seen from Japan)