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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Can you give a bit more of a clue, how big was it for example. I wonder if its actually a slime mould rather than fungus.
I have attached a new photo with a mm ruler next to it, hope it helps identify it.
I don't think its Hypoxylon fragiforme as that looks somewhat different and is hard to the touch e.g.
I had assumed it was hard most of the time and did not start off with a soft stage like is shown in your observation.
My best guess is still a slime mould but I don't really know. If you can revisit the place again then it may be worth taking some more pictures over the weeks to see if it does develop into something more like the Hypoxylon or something different.
Lat/Lng: 51.415238660055, 0.017242580652237
OS grid ref: TQ403703
Likely to be on my backyard