Amazing spirit Stewart.
Worst thing you can do to a car when in deep water is start it.
It maybe worth leaving the battery disconnected for a while or remove the Main fuse in the fuse box so that none of the electrics are live (some are) so if there was a repeat and the ECU compartment got awash then no damage should be caused other than needing to dry out.
No need to say chin up it looks like it's skywards already!
