Ken's oil for brooms deal: fuel for us, a clean-up for Caracas...that would see Caracas benefit from the capital's expertise in policing, tourism, transport, housing and waste disposal.
London, meanwhile, would gain the most obvious asset the Venezuelans have to give: cheap oil. Possibly more than a million barrels of the stuff.
Details of the deal under discussion emerged in a memo seen by the Guardian that described the progress of meetings between the mayor's most senior officials, embassy officials and figures from PDV UK, the Venezuelan state oil company.
It said London would receive an unspecified amount of oil as part of the 1.3m barrels needed to run the buses each year. In return the mayor's aides would promise to "actively and efficiently promote Venezuela's image in the UK" by highlighting the oil deal's benefits for London's poor and by boosting tourism with advertisements on buses.
Caracas, it said, would also benefit from help in running its transport system and in fighting crime, using London's expertise in the use of CCTV, fingerprint technology and neighbourhood policing. Consultants would help with waste disposal, air quality and adult education.
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