Oh dear me, you're dead right. I'm getting much too careless. Not so much Brexit as senescence…
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The stupid thing is that after making the (incorrect query), I thought I'd try it up to the latest point, and I realised then I was a year out, so I tried again with the correct date and all was well. But even though I hadn't sent the post at that point, it didn't occur to me to do the first query again…
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So I've attached the file again with the correct data this time. I also incorrectly said that it give me 1000 ticks, but in fact it was 1047, and this time it's 1695, the same as you.