Got no choice really, the actual battery is ~£200 from other vendors but then I'd have to get the car recovered from the workshop to fit it AND as the engine bay is chocker with the AMG engine it isn't as easy a change as it was on my Old Cortina.
So it was either scrap the car or credit card to the rescue. I'd never get to own anything as fast and yet comfortable as this ever again so I said yes.