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ojread , there is only one authority that issues MOTs the garage just acts as an agent and enters the MOT straight on to the data base as they print the MOT, one entry does both . But there are 100s of insurance companys and they send off details to the dvla once every 2 days or so , they do not instantly put it on the dvla data base it may be 2 or 3 days later, then the dvla have to manually enter the insurance details so that can be another few days.