Hard black fungi on a standing dead Oak. (later) Might actually be Ash!
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
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Are you sure it was Oak as the bark shown look's like Ash to me.
Actually it does look like Ash. There are no other Ashes around but plenty of Oaks - and this is just a trunk - I may have been misled.
Lat/Lng: 51.3443, 0.0742
OS grid ref: TQ445626