Is it cos he's black?

First, let me be clear, I do hope that those who murdered Stephen Lawrence do finally face justice, though I do have some very severe qualms at the lengths that the police seem to want to go to prosecute someone for this crime. Currently the cost of bringing another trial to attempt to prosecute the current defendants has reached well over £10 million including the Lawrence Inquiry plus various other attempts to place the perpetrators at the scene of the crime.
Wikipedia.

Stephen Lawrence (13 September 1974 – 22 April 1993) was a black British teenager from Eltham, southeast London, who was stabbed to death while waiting for a bus on the evening of 22 April 1993.
After the initial investigation, five suspects were arrested but never convicted. It was suggested during the course of investigation that the murder had a racist motive and that Lawrence was killed because he was black, and that the handling of the case by the police and Crown Prosecution Service was affected by issues of race, leading to an inquiry.
In 1999, an inquiry headed by Sir William Macpherson examined the original Metropolitan police investigation and concluded that the force was "institutionally racist". The inquiry has been called 'one of the most important moments in the modern history of criminal justice in Britain'. The report of the examination's work and conclusions was published in 1999 as The Macpherson Report.
On 18 May 2011, it was announced that one of the original suspects, and another man, are to stand trial for the murder in the light of "new and substantial evidence" becoming available. A jury was selected on Monday 14 November 2011, and the trial started on the following day.

I cannot remember a more sustained campaign to find justice for a young man, though I was more than a bit surprised to learn that he had a plaque marking where he died, I know he's famous (for a given value of famous) but not in the respect that a plaque should be awarded, such is the politically correct frenzy surrounding the manner and means of his death and its supposed racist connotations. Yet I cannot help wondering if there were to be the same sort of outcry and sustained attempts to jail anyone if Lawrence were in fact a white teenager.
Guardian.

On a mild November evening in 2003, 14-year-old Charlene Downes kissed her mum goodbye and walked with a friend to visit the Carousel bar on Blackpool's North Pier. When she failed to come home by the following morning, police circulated her description.

Last year, the trial of two men accused over Charlene's murder was halted when the jury failed to reach a verdict. The subsequent retrial collapsed owing to concerns over a key prosecution witness. Both men were cleared of the charges. The case is still open. 

Rumour still has it that Charlene was fed into a mincer and fed as kebabs to unsuspecting punters. The two convicted eventually got compensation from the state for winning their trial, the police however aren't looking for anyone else.
Democracy forum.

Nineteen-year-old Gavin Hopley and his two friends were making their way home to Rochdale after a night out in Oldham when they inadvertently wandered into the Muslim-dominated 'no-go' area of Glodwick and were chased and attacked by a gang of, at least, ten Muslim men and youths.
Unfortunately, though his two friends escaped, Gavin was cornered and brutally beaten by the gang with his head stamped on repeatedly by his assailants. After the attack, a kindly elderly Muslim lady called the emergency services and covered the unconscious teenager with a blanket. He never regained consciousness and later died in hospital.
Six men were eventually jailed for violent disorder and theft following the attack in February 2002 on Gavin Hopley, but no one has been successfully prosecuted for his murder. All of them now walk the streets of Oldham, ostensibly free men, but the abolition of the double jeopardy law which prevented repeat prosecutions can put that in doubt should fresh evidence emerge.
At the time, Gavin's parents issued a public condemnation of certain members of the Muslim community in Oldham for protecting the culprits.
The killers of Gavin Hopley got off, just as those of black teenager Stephen Lawrence did. But how many people know about and remember Gavin Hopley?

Again, the police are not looking for anyone else, as far as they are concerned the case is closed.
So I'm wondering if justice in the UK is based on the colour of your skin, certainly appears to be the case in the Lawrence trial where the police after the Macpherson report on the Lawrence murder accused them of institutionalised racism, but the two I've mentioned have yet to get any justice, there are others out there too let down by a system that seems now to be designed that only if you're not white will you get justice and expenditure on your death.
I do hope that those who murdered Lawrence get justice, but I am truly saddened by the fact that there are so many white murder victims by coloured people who will not.