London short-term rental procedure

Your 180 day period starts on the day you land.

Yes, I understand the period starts running when I land. The question is whether I can satisfy the right-to-rent conditions before I land so I don't spend part of the 180-day period after I land satisfying them and then looking for an apartment.

Maybe contact an estate agent? I have used RightMove to explore rental properties in the UK. It has good filters for furnished/part furnished, lease term, etc. Many properties are listed by estate agents, so that's a way to identify one that specialized in rentals in the area you want to live. They will certainly know what is required.

I think you’ll be better off renting through Airbnb or an agency that specialises in short term lets. I don’t think a regular landlord would be interested in somebody who’s only allowed in the country for 6 months. They have a duty to confirm immigration status so you won’t be able to hide this fact.

The rental market in London is pretty brutal and there’s absolutely no way you will be able to secure a regular rental property before you’re in the country for many reasons including regulatory ones - ID checks etc.

Maybe worth mentioning, the UK visa waiver allowance of 6 Months (180 Days) is not like the Schengen rules of 90 in 180. Technically, there is no limit to you entering and leaving, and each time you enter, a "new" 180 day period starts, the days do not accumulate over multiple visits or time periods.

One could postulate that you could visit, arrange for a place to start leasing at some point, leave, say for a month to mainland Europe, then return at that later date with your 180 days intact.

Of course the caveat is that any entry is subject to the decision of border control. If they see a pattern of entries that indicates you are abusing the system or up to other activities (are resident or working) then they will intervene. It is also wise not to play the exact day game, give yourself a buffer of a couple days to leave. Even an emergency, conditions beyond your control, or miscalculation, is still seen as an overstay.

"I am particularly interested in knowing whether the conditions can be satisfied before entry into the UK so that the clock on the 6-month leave-to-enter period doesn’t start running before I have even found a place to rent. "

The answer to this question is no, due to the right to rent check. You have to present to your landlord either a share code (which you only get if you have a long-term visa or leave to remain, or qualify in a couple of other categories). OR you need to show them your immigration documents.

In theory you could rent once you enter by showing them your passport stamp (you can get this by queuing for a stamp rather than using the egates) but obviously you'd have less than six months left.

Finally as noted, demand for rental properties is high, and landlords will also demand things like UK-based referees, local bank account details, local employment details etc, in addition to the legally required right to rent check.

The other thing to consider if looking at maximizing the 6 months, plus potentially an additional visit during the calendar year, is that after 183 days spent in the UK in a year, they can deem you a resident for tax purposes.

Thanks, all. Very helpful.