Up here in Sporranshire, they have had the 5p charge on plastic bags for a while, as have Wales of course. On my travels through town and country - mostly the latter, there does seem to be less bags festooning our roadsides now. That can't be a bad thing. Remembering to take a re-useable (cotton or PVC) bag into the store is at last now embedded in the swede.
On the odd occasion I forget the re-useable bag and have to pay the 5p a bag charge, at least I know the cash is going to charity. Wadayamean - 4p is syphoned off as "administration charge" ???