Bicycle Tag of bike

Hmmm....
So it's adjacent to a pedestrian crossing, the red line looks like it has been 'shopped and I'm still trying to ascertain the local authority parentage of the lamp post.
Strokes chin.
Decides that making bangers and mash will be easier. And more rewarding.

For the new page....

Were you riding north from the shop on a yellow bike by any chance?

Did you just say "red"?

Nah, north on a black Cinelli at 13.03 p.m. Did I just miss you or were you way earlier?

Say what you see ... nice tag. Won't be able to get it for a few days.

The bike is even in the appropriate gear.

The pink arrows are visible on the signposts in streetview..

Old: red post, Red Post Hill. The only red signpost in all of London Town. Although I'm still not sure why red signposts are significant.

The information on the board is repeated here.

From an 18th-century signpost, to an 18th-century shoe

New:

Clue:

Perform hymn about knitting technique in this street (8,4)

Gah. Of course. I was searching for 'red pole', got gentlemen's clubs, then tried 'red stripe', got thirsty and gave up.

hahaha i can relate.

The pink arrows nearby on streetview are from the 2015 London Classic, no?
https://www.google.co.uk/maps/@51.4568975,-0.0904253,3a,75y,305.78h,70.45t/data=!3m6!1e1!3m4!1s_iqVOSDroZ5TMLYtQw9oeg!2e0!7i13312!8i6656

I found it. I have no idea what the clue means.

Schmerzmittel

Methadon

Old is Spurling Road round the back of the EDT.

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New is not an original

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S-purl-ing

And the shoe in question is still there behind the van

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Great tag, i love the graffiti. Good clue too.

Perform hymn about knitting technique in this street (8,4)

S-purl-ing

I'm quite ignorant about cryptic clues, so could someone explain to me what in the clue indicates the 's', if anything? And what does the 'perform hymn' bit refer to?

"To perform a hymn" can be replaced with "sing", knitting technique is "purling", wikipedia will have something on that, Note the 'about', this is an instruction to wrap "sing" about "purl". Another word for "street" is "road" hence "s-purl-ing road", first letter 8 letters, second 4 letters.

Crossword clues have a lot of instruction words, like 'about', 'sounds like', "One", "Capital" all requiring a particular operation.

I got the purl bit but annoyingly failed to wrap sing around it...

Thanks, Nic! I've never learned those conventions. Someone tried to explain some to me about fifteen years ago, so I was aware of the general idea, but I'd never have thought of the specific crypticisation here. :)

Still, nothing beats being able to drag the image in to Google and finding a picture with the street name in it.
I mean, Cheltenham Ladies ring around to find broken ogres.

Say, that's a nice bike.....
@Diamond_Supercool, And Conor Harrington produces some very strong grafitti images.