In the end I did actually park in that carpark as it was the only large open parking area that had room for a big vehicle AND it was completely empty, apart from a food van. I had to pick up a parcel at the Post Office, otherwise wouldn't have stopped. Needless to say I was all prepared to have a long discussion with the local council if by any chance someone had actually booked me … unfortunately, in a way, on my return there weren't any pink slips on the windscreen.
Friends had told me about a gravel pit parking spot about 10kms north of Esperance which I ended up spending the night at. There was a lovely local man (in his 80's) spending a few nights there to see how he went motorhoming on his own after his wife's death 3 weeks before — he was a typical retired farmer, although he and his wife had obviously been extremely close he was pragmatically getting on with his life and love of the great outdoors.
Travelling further north the next day we camped (on the farmer's recommendation) at Bromus Dam, just south of Norseman. Because of the recent rain the dam had overflowed and so we had a lovely water view from our camp.
Levi found a special treasure at Bromus Dam and of course had to bury it = brown nose