Really chuffed to have worked out what this is, growing on a wood facia of my house. My first slime mould!
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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Lat/Lng: 51.072, -0.69
OS grid ref: SU918311
Outside the window of my house, in mixed broadleaved woodland, altitude 238m, oak, birch, chestnut and willow nearby.