cheers mate theres a print off of the diagnostic the code is 93B2 Safety Battery Terminal
i rang up my local dealer was quoted approx £31 + vat for the BST (red box thing on the battery) but was advised to buy the battery cable aswell at £90 ish + vat !!
surely we dont need the whole cable?.. should be able to just pull out/unplug the old cable and slot into the new BST. has anyone changed theres...any guides available. I rang my local bmw breaker and he said that the BST can be changed on its own.