If its a variable speed limit zone, it will be so marked at the start and end of the zone with permanent signs.
The variable speed limits if lit will have a lit NSL sign at the end of the temporary speed limit section, If there is no NSL sign lit, there is a technical error* Unless of course there is a temporary speed limit to the end of the entire zone, (permanent sign remember) when it no longer applies and becomes advisory.
*you may or may not get away with it in court, but you try proving it. I would estimate, based on experience that 40% of the time electronic motorway signage is by error.
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