Don't really want to go in to too much detail yet as it will probably end up in court. Basically they say that the engine is not covered by warranty as I exceeded the wading depth.
I say it is down to a faulty injector overfuelling. Not one person I have spoken too has come up with a possible, let alone plausible, theory as to how getting it wet/muddy can lead to an engine runaway.
Anyway, various bits of engine apart and out, getting independent experts to provide reports, etc.
Complete waste of time and makes me not want to buy a new vehicle from anyone ever again. Bottom of that non-existent list would be anything from Land Rover.