Gimme a honest guess, how much I would need money to stay in UK for a week?
Last time i checked - Hotels can cost between £60-100 for a night but that figure can also depend on the type of room you want, the time of year and the location. An Air BnB might be cheaper but that often means that you'll be needing to jump on public transport to get in to central london which can take anywhere between 30-90mins.
You might get lucky and find some places that will go as low as £35-40 a night but it all depends on season and location. Hotels located in the city or touristy areas will cost more because thats just how it works.
Food wise its down to your own choice. but i doubt you'd want to spend an entire week eating pot noodle or McDonalds etc etc. steak and chips can vary between £10-20+ depending on where you go and your budget and how much you like to eat - Some times its worth getting air bnb because some places have their own cooking facilities and you can save a lot of money by cooking yourself a meal rather than eating out. picking up some odds and ends in a supermarket can save you a substantial amount of money rather than spending on takeaways.
Factor in a weekly travel pass which is somewhere between £20-40'ish which will get you on the bus, trains & whatever trams you can find - (though if youre happy to ride the bus around it costs significantly less - £1.55 per trip and is capped at £4.65 per day. we also have something called a 'bus hopper fare' so if you pay for a bus then jump on a different bus in the space of 1hr, there wont be any extra charge - It counts as one ticket.)
With the amount of congestion in the city though busses can often be slow even though they have their own dedicated bus lanes. Nevermind stopping at traffic lights and bus stops to pick up/drop off passengers.
London Underground is the fastest way to get around via public transport but it also depends where youre going. Sometimes busses may be more direct.
if youre happy to hire a bike though that might be the cheapest and fastest way to get around. Just get one of them phone holders so you can use google maps while you pedal around.
I cant give you exact numbers but at least that gives you a rough idea of what to expect - At least for London. Everything will be cheaper outside of london. So if you want to go visit scotland or wales. it wont burn you as hard.
@the54thvoid might burn you though if you turn up on his door step.