The campaign wants a corporate manslaughter law

A 40-year-old man, from Hertfordshire, died on 6 May after being hit by an object at the building site, in north London.

The Construction Safety Campaign, which organised Thursday's protest, said in 2003 71 people died on building sites.

It wants a corporate manslaughter law introduced and more resources for the Health and Safety Executive (HSE).

Tony O'Brien, national secretary for the campaign, also wants the levels of fines for guilty construction companies increased.

He told BBC London: "The fines are very low.

Seventy-one building workers got killed last year just going about trying to earn a living Tony O'Brien, national secretary of the Construction Safety Campaign

"Where it has been proven that someone has been killed by negligence, on average the fine is no more than �30,000.

"To big companies that is petty cash."

Speaking about Mr Walsh's death, he said: "Well this is just another death of many deaths to have taken place in the construction industry.

"And it is too many. It is horrendous. Seventy-one building workers got killed last year just going about trying to earn a living.

"We want the government to introduce a corporate manslaughter law which would see people at highest levels in companies be put in prison."

He claimed that because the HSE has had resources cut, inspections had been reduced.

He called for more trade union representatives to help with the site checks.