The Association of Convenience Stores has asked London mayor Ken Livingstone to support its No proof ­ No sale campaign.
ACS chief executive David Rae said 180 MPs and members of national assemblies were behind the campaign, and he hoped the mayor would join them.
"The objective of this campaign is to change the culture of abuse towards staff and retailers who ask for proof-of-age," he said.
Livingstone's recent restriction on sales of spray paints in a bid to curb graffiti in London would also place retailers in a confrontational situation, he said.
"While the culture relating to age-restricted sales remains as it is, enforcing this new law will simply lead to more confrontation and abuse for retailers."

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