Amount of time outside of UK before re-enter after visa expiration

Amount of time outside of UK before re-enter after visa expiration - Close Up Photo of Big Ben under Gloomy Sky

I have a friend who is Japanese and has a UK Working Holiday Visa which expires the next 14th March.

The first question I have is, does my friend need to leave the UK on the 14th of March, or can he do it later without any penalty?

And the other question is, from the moment he leaves UK, how many days he needs to stay outside the country in order to be able to re-enter again without any visa?

As far as I know, Japanese citizens can enter the UK without any visa (just their passport) and stay there for up to 6 months. So, my idea was that he could leave the country on the 14th March and then come back to stay for 6 months more.

Is that possible?






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UPDATES ON EXPIRED UK VISA AND UK VISA VIGNETTE EXTENSION




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