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@Rod_Munch
hmm, well it's pretty clear something funky happened when I stopped for breakfast as there are a couple of weird entries that look like duplicates with erroneous timestamps at that point. The distance jumps from 226km to 552km - the next valid entry is three hours later with a correct total of 295km (which is what it displayed at the point it borked and appeared to be running fine throughout until then). There are no positional update records during those three hours unfortunately so it seems pretty terminal.
The behaviour is pretty much identical to three other 300km ish rides I've done. I think how much data is retained depends on how medieval you are in trying to fix the unit (which won't power on afterwards) or which point you last switched it off (varying from most of it to none of it!). In this case starting it up without the memory card, then saving the ride immediately, worked in terms of getting it running and retaining 75% of the ride.