On the corner of Hart Street and Seething Lane, this is one of the smallest churches in the City of London and one of a handful to survive the Great Fire of 1666 - thanks in this case to the efforts of Sir William Penn (father of the founder of Pennsylvania). It was Samuel Pepys' favourite church - he lived and worked on Seething Lane and is buried, with his wife, under the nave. Some say St Olave's is built on or near the site of the legendary Battle of London Bridge in 1014, in which Olaf II of Norway fought alongside Ethelred the Unready against the Danes. Anyway, the church is dedicated to St Olaf, the patron saint of Norway. It was gutted by bombing during WW2 and restored in 1954. It has some lovely memorials and a fascinating medieval crypt chapel, with a well.

St Paul's church Knightsbridge is an elaborate Victorian church, the first in London to champion the ideals of the ‘Oxford Movement’ – the so-called ‘Tractarians’ who sought to restore a sense of Catholicism to the established Church of England. The building was consecrated in 1843, and its features include iron columns and balcony supports, a striking rood screen and reredos and an unusual series of tiled panels around the walls of the nave.

During WW2, the church was used by the First Aid Nursing Yeomanry (FANY). A memorial on the outside of the north wall commemorates 52 FANYs who died on active service in World War II, carrying out secret intelligence work for the Special Operations Executive in occupied countries as well as providing transport drivers for the Auxiliary Territorial Service (ATS).

The original Temple Bar marked the boundary between the old City of London and the royal area of Westminster. A gate was built there, but this was removed in the 19th century for road widening. The spot is now marked by a Victorian memorial in the middle of the Strand/Fleet Street, close to the Royal Courts of Justice. Temple Bar Gate, after a period of decorating a country house in Hertfordshire, is now in the south-east corner of Paternoster Square, next to St Paul's Cathedral (EC4). The featured article will give you the full story, more or less.

Post code is approximate for the memorial at Temple Bar.

Thames House has been headquarters of the UK's Security Service, or MI5, since 1994. Clearly, the building is not open to the public and unwanted visitors will politely be asked to leave.

From MI5's website: "The role of MI5, as defined in the Security Service Act 1989, is "the protection of national security and in particular its protection against threats such as terrorism, espionage and sabotage, the activities of agents of foreign powers, and from actions intended to overthrow or undermine parliamentary democracy by political, industrial or violent means"."

The Two Chairmen is thought to be one of the oldest pubs in Westminster and is named for the porters who carried sedan chairs in the 18th century for the gentry to and from the cockfighting near Cockpit Steps, virtually opposite the pub. It is very handy for the Houses of Parliament and St James's Park and tends to be less crowded than the pubs closer to Trafalgar Square.