Just an update on this, thank you for all your input and advice. I can now confirm the search is over and not only was a contender found....I will be collecting it in the morning all being well!
I am afraid it's not some mapped 700+ BHP, 63 monster spitting flames, it is a lowly but stylish CLS oil burner! Another thread will be started along with picks as soon as I pick it up.
I was going to add my bit but you’ve already chosen, anyway I can vouch for the 220 CLS Shooting Brake as we moved from a 3.0 Jaguar XF and can barely notice the difference in power.
We tow a caravan with ours and the boss reckons the CLS is smother than the XF.