found the answer

I'm from UK, do you know if they issue letters. Thanks. I will report back on Monday. (4th April)

So I now understand what documents I need

Passport

-Copies of all relevant pages in passport

(data page, entry stamp, extension stamps)

-Letter from my embassy stating they no longer give extension requests.

-The usual bunch of forms they provide you outside the office for covid-extension.

I understand, NP

I know this has been answered before, but wasn't paying attention because I thought the COVID extension was unattainable. Can someone post a list of requirements for the COVID extension. Thanks

I am going to immigration (ChangW) on Monday 4th April, to have my VISA date changed from 22nd June to 8th April. Would this be the time to ask about covid extension now?

So perhaps there is another plan now that Non-B visa's can get a COVID extension

@Robert ******

Thank you very much for your help.

Interesting discussion. So to clarify,

Cancel WP with existing employee, in my case my school has to get a letter from Ministry of education stating my end date. Visit labor office where WP was issued, and get WP cancelled. Visit immigration where I got Non -B, same day as my WP is cancelled. Immigration will cancel/change (please verify) my non b to show my final date of employment (8th April, not 22nd June as is currently). Question: This process can happen before the 8th April? Leave Thailand on 8th April. If I want to return to Thailand make sure I have the correct visa to come back, eg 60 day tourist visa. Thanks for your help.