It’s not particularly comfortable, but £17,000 in London is definitely doable. I’m on £10p.h. for my internship, which works out at just over £17400 for the year.
When I first moved down to London to start work, I spent a few weeks living in a youth hostel, paying £14 a day in a 6-bed dorm. Given that this option doesn’t add bills on top, it makes for a monthly accommodation cost of less than £450, and is a good option whilst you claw together a few hundred for a rental deposit.
I spent evenings doing house viewings and moved into a 3-bed houseshare in North London (zone 4) where rent is £500 and bills about £50 extra. Add in other major costs: a travelcard of £170, and a phone contract of £26, and that’s a total committed spend of £800 per month. Which is only two-thirds of the monthly income accounted for.
You then have approximately £100 a week for all your other costs, which is absolutely fine to live on. It’s very easy to get by on £40 a week for food, and then £60 is free for all incidentals, like a new shirt or the occasional cup of coffee.
You won’t feel particularly flush, but £17000 can be quite a pleasant existence if you take advantage of all the free stuff to do in London. Go to the library, visit all the incredible free museums and galleries in the centre, watch films on Netflix, learn a language, and go out running. Not saving much, but who really expects to save much in their first job?