About 15 cm across. It has clearly seen better days!
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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Is that a second fruit-body below the big one or is that a sort of stalk. If it is a stalk then C utriformis is more likely.
Am no expert but it did seem to me like a second fruit-body with 'root-like' ?mycelial strands beneath.
If it was a second fruit-body and not a stalk then your id is probably sound.
Does look like a rather strange setup but perhaps a bit big for C utriformis? and general shape does not look so suitable. could be a deformed Calvatia gigantea with one growing on top of the other?
Lat/Lng: 51.5382, -3.346
OS grid ref: ST067830