Trevor Parry is one of this world's lowlifes, preying on the elderly, frail and vulnerable to make his own pitiful existence that much more comfortable.

Yesterday he was jailed for 21 months for a sickening scam where he conned a 93-year-old man out of £25,000 for work that any reputable workman would have done for £450.

Quite rightly, his crime was described as "grotesque" by a judge in Oxford Crown Court, while in the understatement of the year, trading standards officers said his work was "shoddy".

Parry ran a number of bogus companies with false addresses, which all appeared in the pages of national directories.

He was no one-off rogue — he was a mastermind determined to rip off the most vulnerable in society.

The work he carried out at one elderly man's house in Summertown, Oxford, involved changing a ball valve in a toilet cistern and a small amount of cement work.

Remarkably, he calculated a few hours' work to be worth what an average person gets paid in a year.

Credit must go to police and Oxfordshire County Council's trading standards team for their persistence in bringing this vulgar individual before the courts.

Their high-profile crackdown in the city and county has yielded great results, but still these vultures lurk in the shadows, looking to make a quick buck.

Have a good look at this man's face just in case he or his equally repulsive henchman ever come calling.