Short thread about a plant ID that made my brother laugh so much, because very 'on-brand' for me. Also an answer to "how many botanists does it take to ... ?"
So last week on my exercise walk around the local streets whilst looking at Whitlowgrass seedpods and trees

I spot a plant I don't know, growing in the pavement next to a house wall. It's defo a buttercup & not a normal one so I take a couple of photos & wander home. It's hairy & has reflexed sepals so I think maybe Hairy Buttercup & email BSBI recorder @davebarlo for 2nd opinion

He replies it's possible, but "Your close up image is a little blurred" can you check again? I say I'll go back next day. In the meantime, whilst I'm making me tea, local BSBI member Colin visits the site on his bike-ride and takes better photos (not shown) of the right bits

and suggests the rare St Martin's Buttercup which apparently can appear from bird seed. I'm totally in favour of this because who even knew they named a buttercup after me? Those better photographs get sent to BSBI expert Tim Rich and by the next morning we get a definite ID

of Ranunculus parviflorus Small-flowered buttercup. So later that day I wander the streets to see if it is just there or all over. I find it outside one house only, mainly in the border by the wall from where I think it has escaped onto the pavement - about 75-100-ish plants

and I took a piece home to check its bits and bobs against the key in Stace 4 - the glabrous receptacle, the small flowers <8mm. It also has curved spines on the fruits.
This is currently its most northerly English record.
Answer: 4 #BotanyTeamWork

It is a truth universally acknowledged that when confronted with a plant you have never seen before, it will occur when you don't have a flora to hand, in a place you don't expect, and you will fail to photograph the right bits accurately enough to enable a correct ID.