Whiskey Kilo Wanderer, I was airborne yesterday in the Southend area (about 15.00 local) but the transcript you've quoted wasn't me, I was minus 400 feet and showing the wrong code.
I know some would say that flying brings forward the risk of being 6 feet under but 400 !!
Odd (or perhaps not) that it happened twice in the same day with the same aircraft type.
Rod 1, I haven't decided yet, other than that it is going to get changed for something later this year.