UK Employment Law - please see below?

A friend of mine has told me he is being bullied at work. The threats are not physical but his Supervisor calls him "Oi Mush", rather than by his name. The Supervisor is always going on at him, criticising what he does, shouting at him, and generally distracts him. My friend is so shaken by the verbal onslaught that he keeps making mistakes, which gives the Supervisor more ammo. He can't go to the MD or any other director because their attitude is, as long as the work gets done, who cares? My friend has only been employed for 4 months and after a year unemployed is scared stiff of being sacked due to the mistakes he keeps making and after such a short time he has no employment rights. I have also been told that there is too much work for the amount of staff as one of their branches have been closed and the work moved to my friends office. The staff have been told (not in so many words) to forget their lives - they work until they drop or they will be replaced (unpaid overtime too). They don't belong to a union. Is there an Establishment or Government Office that protects workers rights?