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Tuesday 15 September is the member booking opening date for the April 2027 CO2B exam. Non-members can book from Tuesday 22 September. Venues will open at the following times (all times shown are in UK time) – India 11am, UK venues 3pm.  Candidates wishing to book both the CO2A and CO2B exam together can do so from Tuesday 22 September when the CO2A February bookings will open