Seems to be grown from the roots of a large Acacia tree which was killed by frost about 4 years ago, Had to cut it down leaving the roots
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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Added a new picture Hope it helps but it looks like Xylaria polymorpha
Thanks for the extra photo I am still not 100% so would rather stick to Xylaria the only way to be sure id by looking at the spores through a microscope sorry I cannot help further.
Lat/Lng: 51.0712, -4.0474
OS grid ref: SS566322