Sixty-five percent of British streets have chewing gum stuck on them, a spokesman from Keep Britain Tidy told CNN.

CNN: New gum could mean sticky end for mess

Tim Burns, the head of Waste Watch - part of Keep Britain Tidy - said councils should be cautious about reward schemes.

BBC: Bracknell Forest residents rewarded for recycling

The Tree Council will plant more than 1, 000 trees across four sites and Keep Britain Tidy will plant 100, 000 trees across 750 sites.

BBC: Government launches ?4.2m urban tree-planting plan

Keep Britain Tidy said fast-food litter was one of the main problems these days, and that smoking-related litter had doubled since bans were introduced for enclosed public places.

BBC: Huge litter pick gets under way

We've also just won an Encam Keep Britain Tidy award.

BBC: Camden Council response

Delegates at the conference, partly organised by the Keep Britain Tidy group and the British Toilet Association, are debating whether authorities could charge more for the use of public conveniences.

BBC: NEWS | UK | England | London | Lack of public loos ruins streets