"BUT, Block hours are defined as chocks off to chocks on, so I can't see any way around them having to change- but I'm sure they'll try for later rater than sooner!"
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Omniscient Wiz....it depends on what part of the world you happen to be in and whom you work for. ACARS brake release is used by many, DGS docking systems that measure actual A/C movement by others. Wheel chocks? Not so much anymore.
BTW, TCat is correct. In the USA, 1,000 hrs "block" time is the max, not 1,200.