peggyundercrackers
It's fairly standard that you have to have enough money to support yourself when entering a non EU country, and for foreigners coming in to Britain.
OP if that is you, £4 a day is not enough to buy a burger and a cinema ticket.
I was 16 when I did my first long haul (actually first flight period) flight to stay with strangers in Australia, they were relatives but I'd never met them.
That was early 1980s and I took about £1000 plus credit cards. It was not all 'fun' money, I had instructions to pay for a certain number of meals, gifts for my hosts etc.
These days I'd take £350 for a weekend in London.
OP's son because I think that's who replied last time, you are being naive. I have done the long haaul to stay with strangers at a similar age, I've done long haul to stay with friends of friends, couch surfed, met people from the internet IRL etc etc. I've also hosted friends of friends, couch surfers, people I don't know well.
It's fantastic that we can and do chat to people from all over the world and make long distance friendships but you also need to have a big dose of reality.
On my first morning in Buenos Aires I met a lovely gentleman who spoke good English and offered to show me 'his beautiful city', and I was tempted, but declined because I had that big dose of reality with me.
My rule of thumb is to treat everyone you meat on line as an Axe wielding maniac, and let things develop from there. It has stood me in good stead.