As I understand it, the problem with singular jabs given one year apart is that the child is still vulnerable to the two diseases not covered.
Here in the States, you can request and get single injections.
Wakefield admitted to some less than scientific research and at least ten of his colleagues withdrew their names from his paper's conclusions when they discovered his "fudging of the facts". It does not mean he is wrong. But no one has been able to duplicate the findings because of flawed methods.