Professor David Walker, Deputy Chief Medical Officer, told Daybreak that the launch of the mass immunisation scheme was purely coincidence that it came at the same time as the MMR scare.
He said: "The timing is simply this is the time it's taken to develop the vaccine and to develop it's implementation."
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The move comes amid a motion of no confidence that was tabled against Labour leader Jeremy Corbyn.
The first anniversary of the Sousse terrorist attack - which left 30 Britons dead - will be marked by families of the victims on Sunday.
Since Friday's EU result, the Liberal Democrats have recorded thousands of voters signing up to become members.