Shoppers have accused chocolate makers of "shrinkflation" after new bags of Revels, Maltesers and M&Ms are the same price - but weigh up to 13g less."

Lee Tyler, 36, spotted the change because a supermarket had put the old and "new" bags on the same shelf."

In Tesco in Hook, Hampshire, last week (20/02) he saw the old Revels priced at £1.75 - "reduced to clear" to £1.49 - weighing in at 112g."

A bag marked "new" was also priced at £1.75 but weighs just 101g - 11g less."

In the same section, a classic bag of Maltesers was also reduced from £1.75 to £1.49 weighing in at 102g.

But the "new" £1.75 bag was elsewhere on the shelf, weighing 93g - 9g less."

Finally an old bag of £1.75 M&Ms weighs 125g - but the new one is just 112g version; 13g less.

It is understood the old heavier bags will soon be cleared from the shelves to make way for the lighter alternatives.

Lee, who works in a restaurant, said: "I've worked in retail management for a long time and normally these are kept separate."

"I've never seen merchandise together before and I was chatting with friends about shrinkflation."

"The weight inside is down but they haven't reduced the amount of packaging or plastic."

"The new ones are being priced at what the old ones were."

"So you're paying the same for less"

"When I was growing up these bags were a quarter of a kg each but these new bags were 93g for what they call the big pouch."

"These were a quid a couple of Easters ago and they're going up at £1.75 now," he added."

A Mars Wrigley UK spokesperson said: "At Mars Wrigley, our focus is always on offering great tasting, high quality chocolate at the best possible value. "

"We have been actively looking at ways to absorb the rising costs of raw materials and operations, but unfortunately, the growing pressures mean that more needs to be done. "

"Reducing the size of some of our products, whilst raising prices, is not a decision we have taken lightly but it is necessary for shoppers to still be able to enjoy their favourite treats without compromising on quality or taste."

Tesco declined to comment.