Before we get to that, here are pictures of a Gorse-covered bank at the foot of Birch Walk, behind warehouse-type retail outlets on Fraser Rd - there's a lot of Buddleia got in there too - and a patch of Wood Sage.
There's also some Hart's-tongue Fern on what appears to be a filled-in arch over what may have been a bridge over a railway line out of the quarry. This is an infrequent plant in these relatively dry parts.
Site X (there was plenty of evidence of other people having indeed been on here lately, including trailbike tyre tracks) was dominated by Hawthorn scrub, with quite a lot of Roses. There was a large swathe of Spanish Broom (Spartium junceum) in one area, and another plant with a smaller specimen growing under it, some considerable distance away. This non-native must have got here as seed. There were also a number of Pyracantha shrubs. 3 Fennel were sprouting close to one another. Dried seedheads indicated the presence of Wild Carrot, Black Knapweed and Teasel.
Animals seen included a Fox and - as firsts for me in the local area for some years - a Goldfinch and a Chaffinch.
Spanish Broom on a former landfill site in Erith
Pyracantha is established here too
Fennel re-sprouting here early in the season