So is this your 3rd pump failure? This is a real shame. I remember back in March when we were both full of expectation and now those feelings have all gone.
I count myself lucky that so far I've just had the one pump failure and we've just done a 3 week 3k mile round trip to Italy without an issue .
Why don't you ask them (BMW GB) to give you a new car with the same spec at no cost to yourself. They weren't averse to this idea when I suggested it back in May after my pump went.
Hope something positive comes out of this for you.