Small plant growing from tall urban wall.
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To pin down at this stage. It looks rather like one of the Compositae (Asteraceae now?), maybe groundsel: but this is a guess. Keep and eye on it, and let's see a flower later on!
Groundsel (Senecio vulgaris) is what i would guess too.
Thanks for the suggestion, Roger and Norris.
I will keep an eye on it.
I don't think it's groundsel though. I don't have the vocabulary to explain why not . . it's not just that the leaves are wider but it has an air about it that suggests it will grow bigger.
Blog - Loose and Leafy - http://looseandleafy.blogspot.com/
The leaves are a little too jagged-edged and look slightly prickly. I agreed with the daisy family ...... maybe one of the hawkweeds or hawkbeards with sparse clusters of yellow dandelion-like flowers?
Lat/Lng: 50.5924, -2.4669
OS grid ref: SY670770