Windsor Castle itself took fans of the Firm behind the scenes in a video published on the Royal Family’s social media page on Saturday 30 October. The original video follows Fjodor van den Broek, the horological conservator, also known as the clockmaker of the castle, as he gets ready for a busy weekend.

       Twice a year, the clock expert is in charge of changing the time on all the devices and clocks owned by the Windsor estate.

       "We have 400 clocks on the estate, of which 250 are inside the castle and the rest are distributed around the estate," he said.

       "When we set the clocks backwards in winter it's a bit of a different process for every clock.

       "In summer it's much easier because every clock just goes forward one hour and for each time it takes me about a weekend to set all the clocks to the right time."

       The horological conservator also mentions he visits Windsor Castle every week to check on the clocks.

       "Just like a car needs an MOT every now and then, a clock will need a service every couple of years.

       "I get to know every clock very well," he added.

       Clocks in the Queen's residences are part of the Royal Collection Trust (RCT).

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       According to the RCT's website, staff spend 40 hours tweaking the Queen’s clock collection before daylight-saving time kicks in.

       Buckingham Palace has the most at 600, while Windsor Castle has 450, and the Palace at Holyroodhouse has 50.

       "It's just myself, and I have one colleague at Buckingham Palace who changes all the clocks there," Fjodor told the BBC in 2020.

       For some clocks, there is an extra time difference to take into account.

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       "People are still amazed that at Windsor Castle and Buckingham Palace there is a small time zone in the kitchens, where the clocks are always five minutes fast.

       "This is so that the food arrives on time... it's a constant reminder that this is important.

       "I check all the clocks in the state apartments before the public arrives to make sure they're on time.

       "Most of the clocks are quite accurate but every now and then, for no reason, they will suddenly start losing or gaining time - something which I've just started calling 'life'.

       "So I do have to keep a constant eye on them."