>>> Pernicious Anaemia is Vitamin B12 deficiency
That's not strictly true. Pernicious anaemia is actually an autoimmune condition which causes your body's immune system to attack healthy cells. It's those cells which would normally produce a substance which mixes with the B12 in your diet, allowing it to be absorbed into your body. Without those cells functioning normally your body can't absorb B12. So pernicious anaemia is really a
cause of B12 deficiency, rather than the condition itself. (i.e. it's possible to have a B12 deficiency without having pernicious anaemia).
Iron deficiency anaemia has many possibles causes (as well as,of course, a simple lack of iron in your diet), most of which are listed here:
http://www.nhs.uk/Conditions/Anaemia-iron-deficiency-/Pages/Causes.aspx
(Note that they include gastrointestinal blood loss during the menopause, so that might be one possibility).
There would seem to be no reason why having one condition should exclude the other, so the answer to "Is it possible to have both?" would seem to be "Yes".