Both the winter school and the workshop will be held in the MALL inside the School of Mathematics at the University of Leeds.
Full address: School of Mathematics, University of Leeds, LS2 9JT, Leeds UK
If you intend to take a plane to London and a train to Leeds, beware that last minute train tickets are quite expensive. You can check train times and ticket prices at http://www.nationalrail.co.uk/
If you need an invitation letter for your visa please email this request to the organisers.