Deputy Prime Minister Nick Clegg says he hopes the money raised from the proposed 5p charge on plastic bags will be given to good causes.
The charge was unveiled at the Lib Dem conference today but government sources have acknowledged they are powerless to force retailers to hand over the money.
Clegg said: "We will discuss with retailers how the money raised should be spent but I call on them to follow the lead of industry in Wales and donate the proceeds to charity."
More top news
The government is encouraging motorists to think twice about buying diesel cars in a bid to improve air quality.
Atlantic frontal systems spread rain in from the northwest on both weekend days. Windy - with gales across the north and west but mild.
The band announced at a free concert on Friday that they would take over the event's Pyramid stage on Saturday June 25.