Yeah, thanks mate... I thought it was the battery too as the battery light jumps up just moments before it dies... happens infrequently but too damn often to pose a dangerous threat to safety. I might buy a new battery and see how that goes.
With the BOV, I don' think it is this... as I have had this issue even with the stock BOV, the 2nd BOV and this new HKS BOV... there is no Boost leak as I have taken the car for a spin a few times, actually is more responsive.
I've checked for any loose hoses, unplugged wires etc and all seems to work fine... don't know what the problem is... I will see what other suggestions people have and well, might have to bring it to the mechanic if all fails.
Thanks for your help mate.