Portugal to london

hi! i'm moving from portugal to london and I have a few questions. Do I need any documents to rent a room? Do I need to have a job lined up to ask for my national insurance number? IS there anything I need to know before I go?

Be very careful where you live. Some areas of London are positively dangerous with a lot of drug related violent crime.

https://safearound.com/europe/united-kingdom/london/https://www.plumplot.co.uk/London-viole … stics.html