
The London Underground is divided into six zones. If you plan to cross several fare zones throughout the day, then you might be better off buying a travelcard. These can be bought from ticket machines and newsagents.
But if you’re going to be making several bus and train trips during your stay in London, then it pays to buy an Oyster Card instead. Oyster Card holders benefit from reduced ticket fares on London’s tube trains and buses.
Talk about train journeys in London
Find restaurants near Houses of Parliament
Find a hotel near Houses of Parliament