IME most UK jobs have probationary periods. There's also a statutory probationary period of 2 years where you can be fired for any[1] reason. [1] strictly not

IME most UK jobs have probationary periods. There's also a statutory probationary period of 2 years where you can be fired for any[1] reason. [1] strictly not any reason, you can't be discriminated against, but enough reasons that they could invent one.