Two big-time drug dealers who were jailed for their parts in flooding east Norfolk with cocaine yesterday had their 'unduly lenient' sentences increased by top judges.

Cheshire man Robert Munday sold large quantities of high purity cocaine from his house for distribution by Great Yarmouth dealer Sam Asbury.

Last April, they both admitted conspiracy to supply cocaine. Munday, 30, was jailed for four years and eight months, while Asbury, also 30, was sentenced to four years.

But at the Court of Appeal, three top judges said the sentences were 'unduly lenient' and increased them to seven-and-a-half and six years respectively.

Lord Justice Leveson, sitting with Lord Justice Pitchford and Judge Warwick McKinnon, said Munday, of Wilmslow, was a major player who was close to the original importer of the drugs.

One of his customers was Asbury, of Uplands Avenue, Caister, whom he supplied with large amounts of cocaine via courier to be sold on in the Yarmouth area.

The pair were caught out after a police surveillance operation revealed that Asbury was responsible for dealing in the east Norfolk area and that Munday was his primary source.

When police tried to arrest him, Asbury drove off in his van, throwing drugs and other items from the window, resulting in an additional conviction for dangerous driving.

Their cases were back in court yesterday after a reference by the country's top law officer, the attorney general, Dominic Grieve QC, who said the sentences were too short.

Lord Justice Leveson said: 'We have no doubt that these sentences were unduly lenient.

'In our judgment, the proper starting point should have been, in the case of Munday, 12 years, and, in the case of Asbury, a sentence of 10 years.

'Making allowance for pleas of guilty and all the circumstances, the resulting sentence for Munday is one of seven-and-a-half years' imprisonment. For Asbury, we substitute a sentence of six years' imprisonment.'

At last year's trial, it was revealed that the cocaine was dealt in the Yarmouth, Gorleston and Caister areas,

It was estimated that Munday had benefited from the drugs dealing operation to a tune of more than �1m.

When arrested he was found to have �77,500 in cash in his home and a new Audi TT car which were seized by police.