My boss gave me permission to return to England while my school are currently having to work online from home. I verbally agreed to return to Thailand if the school reopened. He said it looks ‘likely’ the school will reopen 14th June (even though the situation is very serious and there’s no confirmation the school will open). I said I am happy to continue working online from the UK but do not want to confirm returning to Thailand until there is full evidence and confirmation that the school can safely return. He declined my offer of continuing to teach online (despite the fact we have at least 2 weeks left of online teaching) even though it is becoming clearer everyday that things don’t look hopeful for reopening and has instead terminated my contract. We get paid at the end of each month and I have worked up to the 21st May which means I will be owed almost a full months pay on 31st May. However, the school are not going to pay me because I wouldn’t return. Is this lawful?