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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Did you check for milk because it also looks a bit like Lactarius vellereus
Sorry flaxton but I did not check for milk.
However on looking up your suggestion the rosy coloration on the cap suggests Lactarius controversus rather than L vellereus - what do you think?
That's the one I ment to suggest - honest.
Most definitely Lactarius controversus!
With Poplar, its good to try and remember to get tree idents.
Not sure anyone can say definitely what this is without seeing either a vertical section or the gills, but it does look like a Milkcap, Lactarius, in which case there should have been milky drops on the gills or damaged flesh. L. controversus is often darker than this; L. vellereus probably paler and fleecier.
Lat/Lng: 51.1424, -0.3878
OS grid ref: TQ128393