Sketched out concepts, using Excalidraw[2]
Bats are legally protected in the UK, so it's generally not possible to remove them.
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1L decoder, d=7, 1h, ff=14
The new contract with a different provider was only announced on 5 January this year.
For implementers, the locking model adds a fair amount of non-trivial internal bookkeeping. Every operation must check lock state, readers must be tracked, and the interplay between locks, cancellation, and error states creates a matrix of edge cases that must all be handled correctly.