Bark beetle galleries on an old fallen Elm trunk.
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These galleries don't look right for Scolytus which are generally a single main gallery with 'blind' galleries off at about right angles from the main.
Well, there is one central gallery, currently with some water in it, and other blind galleries leading off, so to me it seems to fit your description? There were other similar galleries nearby.
Lat/Lng: 51.348775, 0.066911666666667
OS grid ref: TQ440631