PETROL prices are on the rise again as motorists await a possible hike in fuel duty in Chancellor Gordon Brown's today's pre-Budget statement.

The average UK price of petrol has risen one fifth of a penny to 86.17p a litre, the AA Motoring Trust said.

Prices at Morrisons have risen by an average of 0.56p a litre, while Tesco prices have gone up 0.47p. Average diesel prices across the UK have risen a tenth of a penny to 91.69p a litre.

The trust's petrol price analyst Ruth Bridger said: "The Chancellor needs to remember that, had he not deferred the 1.25p a litre inflationary rise in petrol duty, rising to 1.47p with VAT, the highest-ever average price of UK petrol in August would have broken through the critical £1-a-litre barrier.

"As it was, with manipulation of the petrol-diesel price differential by retailers, the petrol price peaked at 98.54p a litre and the threat of motorist protest did not arise."