If my neighbor vanished, I'd probably start by checking if their car was still there. Then I'd think about whether they mentioned any plans or seemed unusually stressed lately. After that, I'd probably call the police, because, you know, missing person.

honestly the post piling up is the biggest tell here. in zone 1 they collect mail almost daily, so if it's been more than a few days, that's a real sign.

you could try the council too, they do housing welfare checks in london if you're worried about a resident. but police via 101 is faster and they can access his flat if needed.

one thing nobody's mentioned: check if his utilities are still running. if the smart meter outside his flat is still blinking or the hallway electric box is humming, someone's paying the bill. that plus the dark windows might mean he's staying somewhere else but keeping the place, which would be weird given his socials are gone.

also, if he's big 4, they'd have a duty of care thing internally. the police can request a wellness contact through their HR, that's standard for firms that size. just don't expect them to tell you anything directly.

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I'd go ahead and ring the police non-emergency line, 101, and ask for a welfare check. They won't make a fuss about it, this is exactly the kind of thing they deal with daily, especially in Zone 1 where it's easy for someone to slip through the cracks. The wiped social media is the big red flag for me, people don't usually delete everything unless they're in trouble or they want to disappear on purpose.

The Big 4 firm won't talk to you directly, but the police can contact their HR through official channels if they need to. You could also try knocking on a couple of other neighbours' doors, someone might have seen him coming or going at odd hours, or heard something through the walls. If the police do a welfare check and find nothing wrong, you've lost maybe an hour of your day, that's a small price for peace of mind. I've seen this play out in my building before, it turned out the guy had a mental health crisis and was in hospital, the police were the ones who found him.

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It sounds like you've already done a lot. The unanswered texts and wiped social media are definitely concerning, especially combined with the piled-up mail and darkened flat. You're right not to want to cause a fuss unnecessarily, but given everything, contacting the police is probably the best next step. They're trained to handle these situations sensitively and have resources to investigate even if he doesn't have close family here. Better to err on the side of caution.

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SpareRoom's "rooms wanted" ads are underrated for this. people post what they're currently paying alongside what they want next, so you can scrape a rough sense of going rates by postcode without anyone knowing you looked. it skews young and flatshare heavy tho, so not much use if you're after 2-beds in zone 2.

Another one is just the depozit or tenancy deposit scheme data. not public-facing, but your council's housing officer can tell you median rents from deposit registrations if you email them under FOI. takes weeks, but its proper anon and nobody clocks u.

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Rightmove and Zoopla only show asking rents, which are often 10 to 15 percent above what a place actually goes for, so they're a poor benchmark. The trick I've used is the ONS Price Index of Private Rents, which breaks things down to borough level and is genuinely anonymous since it's aggregate data, no listing or account needed. For something more granular, the London Renters Union runs a rent reporting tool where you submit what you're paying with your postcode and it maps it against others nearby, though the coverage is patchy outside the inner boroughs.

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the openrent "rent check" thing is decent for zones 3-4 where the unions tool barely reaches. also worth checking the london.gov.uk planning portal for new build applications, they list "affordable" and market rent figures per unit in the viability assessments, which is basically the developer telling the council what they expect to charge. bit of a faff to dig through but its public, anonymous & nobody knows ur looking

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