LMAO! that's so funny.
You'd think some coppers driving around Derbyshire (which is practically the home of most Land Rovers in the UK, including mine a lot of the time) would know about driving through water, especially since there are a number of deep water fords in Derbyshire. If they'd have gone through at a steady speed they'd have probably made it just fine. Besides which, most people around those parts could have told them to just shove a bit of cardboard down the front of the engine bay while they drove through water and then take it out - that usually works.
As it is, they were probably just rushing to get to the chippy in time, before it shut!
Chock