Just been for a follow up appointment at hospital. Doctor checking my notes said 

a) my blood analysis was great except b12 count was a little low
I'm
b) my blood analysis was taken in February.

I replied, good job I'm healthy and good job I made a few changes to my diet since Feb, ie I haven't been strict vegan for many months.

B12 deficiencies would explain a couple of misfires, which is why I had the blood tests in the first place.

Sorry vegans but after 5 years doing my best to follow the plan, any diet that requires a supplement is not for me.