Japan as a British supplier in World War II

What happens if Japan avoids war in China and sells ships and war materials to Britain during World War II?

Britain gains a major eastern supplier, Japan gains oil and technical experience, and Allied logistics in Asia and the Mediterranean become much easier.

Britain would welcome Japanese industrial output and would have a strong incentive to keep oil flowing in return. Japanese factories could supply ammunition and equipment much closer to the Mediterranean and Indian Ocean theaters than British yards. Building to British specifications would also transfer useful manufacturing experience to Japan. The arrangement therefore improves Allied logistics while deepening the technical relationship between two navies that historically became enemies.