That's more like it - and, in terms of voltage drop limits, would give you best part of 100A's capacity to play with! If there is at least 25mm² worth of earth cable (quite probably more, because the armour of the cable {assuming it's armoured cable!} could also 'count'), that would probably be sufficient for 'earth exporting', if that's what is advised (but, as I said, don't bank on that!).Apologies John, 140m is indeed a typo. It is 40m approx, and yes there is a separate 25mm earth cable.
Kind Regards, John