DH was sacked on the spot and escorted from building, It is only 2 months since he passed his probationary period with glowing reports. They stated that it was not gross misconduct and the reason they gave (as I understand it) were there had been too many complaints about his department (all because of very low staffing and high work load, he'd just taken on 4 new starters within the last week to adress this) He was given no opportunity to defend himself or improve. There had been no hint that he had to improve or his job was on the line and he had put the staff in place so that things would improve, They say they have a clause in his contract (he was not allowed to retrieve his copy from his desk) that says they do not have to follow the company disciplinary proceeding if they don't want to, therefore this is not unfair dismissal.
Is it legal to do this?