A mail order pornographer from Coventry who believed his clients had the right to watch the extreme "filth" he specialised in has been sentenced to 18 months in jail.

For more than a decade John Bluck, 51, ran a catalogue pornography business between his home in the Midlands and a west London mailbox.

Bluck specialised in extreme titles featuring defecation, urination, vomiting, torture and rape, but his one-man business was described in court as "failing" because many of his clients had moved to the internet for more immediate gratification.

Last year his pornography empire, trading as RGB Productions, was finally smashed by police who, prosecutor Brett Weaver told Southwark Crown Court in London, had been surveying his dealings since 1998.

When police raided his home on December 8, officers found more than 2,500 unclassified pornographic videos and DVDs, with nearly 200 of these contravening the Obscene Publications Act.

Bluck pleaded guilty to all charges at Westminster Magistrates' Court in December.

Judge Michael Gledhill said: "You are highly intelligent, you began a university degree and completed two years of it and fell out after your criminal activities - you are psychologically flawed.

"I accept that the business was declining because the sort of people who want to indulge in torture, defecation, urination were able to do that more efficiently by downloading such filth from the internet.

"Your personal view is that those who want to look at it should be allowed and you don't care that it is against the law. You are an arrogant man and regard yourself as above the law."

With his long, grey hair falling across his face as he bowed his head in the dock, Bluck, wearing a denim jacket and jeans, was handed an 18-month sentence for three charges of possessing obscene material for gain, three further charges of publishing obscene material, six counts of supplying unclassified recordings and a single charge of laundering more than £25,000.