S1.12 — Strand Building, First Floor

Come to King's main entrance on the Strand (postcode WC2R 2LS), which has a circular welcome desk and wooden floors. When you go in, you'll see 3 lifts in front of you. To the left is a staircase. Take that, go one floor up, turn right through the double doors then keep going down that corridor. S1.12 is clearly marked — it also has submarine-like portholes for easy identification!