Is it bank cheque or check?

It depends what country you are in! In the United Kingdom, the noun meaning a piece of paper printed by a bank that allows you to buy something or pay someone is spelled cheque. In American English, it is spelled check.

In every other use of check as either a noun or verb, the spelling is the same in American and British English.

You can use the QuillBot Grammar Checker to ensure you use check and cheque correctly.