I dumped the car on the drive and drove Roger to Edinburgh for the weekend. Ahh, nice.
Returned today, and took the Benz apart - looks like I really was lucky; it isn't nearly as bad as it looks.

With battery tray out. Obviously bottom carpet is gone, along with rear mirror, top and boot carpets. It does seem to have killed the built in charger though to the left of this pic. Smoke damage on pumps cleaned up easily enough. The side wall of the damaged battery held, so there is none of the expected battery acid damage.

But amazingly, all the melted bits wiped straight off the powder coated battery tray. I can now *really* recommend this chrome powder coating! Other two batteries survived with only a few battle scars.

Here are the only other knackered bits. One power lead, one hose (that caused the short), the mirror and one battery.

Image above shows how I've thrown another hydraulic hose on (it's far too long, but will do for now) and bridged the power across so that both pumps now run off one battery bank. Not ideal, but at least my daily is back on the road again until I get some disposable cash to make it pretty again!