A few interesting finds from yesterday;
This "pretty red buttercup" turned out to be an escaped clematis, growing on a roadside soil-heap just below Brean Down, Somerset. They're a confusing bunch, but so far I've ID'd it as
Purple Clematis (
Clematis viticella), probably of the cultivar "Rubra".

(
Purple Clematis, C. viticella - I think...
)
Just along the coast at Uphill, this colony of
Fern-leaf Yarrow (
Achillea filipendulina) seemed established and thriving on an old stone wall in the village. I couldn't find it growing in any of the neighbouring gardens, so exactly where it came from is a mystery.

(
Fern-leaf Yarrow, Achillea filipendulina)
Back on my usual Bristol patch, our lone self-sown bush of
Mrs Wilson's Barberry (
Berberis wilsonae) is flowering well, pleasing after some council idiot gave it a severe hammering with hedge-clippers last year

(
Mrs Wilson's Barberry, Berberis wilsoniae)
And, though it's a plant we don't get a lot of in this area, I
think this is
Hawkweed Oxtongue (
Picris hieracioides)...
Input from anyone who's more familiar with the species would be very welcome