It depends if the restriction is under the RTA (and covered by a TRO), in which case signage must conform to legislation, or if it is under local byelaws (which I know far less about).
@NotThamesWater started
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It depends if the restriction is under the RTA (and covered by a TRO), in which case signage must conform to legislation, or if it is under local byelaws (which I know far less about).