Expensive is the word I'd use. I live in North London (Zone 4 on the tube) and for a nice one bedroomed flat the rent is the best part of £700 per month. I don't know what the cost would be for a house share and there are certainly cheaper parts of London, the SE of the capital probably being handy for London Guildhall transport-wise. A weekly travelcard is about £28 from zone 4 otherwise food and utility bills will be much as anywhere else I'd imagine. There are sure to be other places in the country that offer a similar course without the same overheads. Hope this helps.