GREEN CAB SHELTER (n.) Wooden struckture bedecked in green whereso it doth enable those within to debate the London Mayor’s defects safe in the knowledge the assembled will concur
Dr. Johnson’s London Dictionary for publick consumption in the twenty-first century avail yourself on Twitter @JohnsonsLondon
CabbieBlog 
When I was in the Ambulance Service, the Cabbie shelters would also serve us tea and sandwiches if we asked. Great little places.
Cheers, Pete.
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They still make most of their money from off-sales.
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