WANTED: ~52cm lightweight steel bike to replace my stolen one

Hi there, sadly my bike's been stolen today so I'm in urgent need of a new one, size 50-53cm (ideally 52 square). I'll attach a couple of photos of the one I used to have – a lightweight quirky fixed lo-pro, Reynolds 753 tubing. If anyone has something similar, that would be perfect. Doesn't have to be either lo-pro or fixed. I'll consider SS, road, cyclocross… but it has to be a lightweight steel frame please. Nothing really expensive, but I'll pay a fair price if I like the bike and if it's worth it. My immediate budget is probably around £400 but can stretch.
(I looked around on the forum but no luck yet, so I'm posting an ad in case someone is selling a bike that I haven't seen in Classifieds.)
Thank you!
Tutu
P.S. If you see my bike anywhere for sale, please let me know! I put it together myself and loved it dearly. It even had a drawing of a cycling bear on the saddle…

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one more shot with a pigeon

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P.S. I'm currently based in London so ideally would buy the bike that's also based here!

Look like a cheap lock you used

Yeah I know I was testing my luck with a cheap lock for over three years and was finally punished. I mostly lock it with a Kryptonite messenger though. Not that it deters the thieves.

I feel like ive seen this bike, you dont climb at the castle do you?

that's right it's been stolen from the bike park at the castle today :(
but i've been parking it almost every day there so didn't think twice

damn thats a bummer. Ill keep any eye out, its a distinctive bike!

Bit of a cheap shot there fella!

Victim blaming