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We filter out very small polygons from the original data to remove glitches. These glitches are caused by trying to subtract the water from a polygon that includes some land and some water, but using two different definitions or resolutions of mean high water line. If we don’t do this then we end up with a bunch of very small polygons which lie far outside the understood area of a place, causing large overspill. We need to increase the threshold for this process because we’re still seeing this problem around Bristol and Norwich. This does mean we lose a few very small polygons in places like Shetland and the Scilly Isles, but not in such a way that we would avoid broadcasting to them (because they’d still be caught by the simplification and overspill).