King's Head, London Wall

Cross the road as soon as you leave Barbican tube and take the road under the Barbican (Beech Street). Walk along until you see daylight again and you'll see the pub in front of you on the right. Moorgate: there are lots of exits at Moorgate station, but the simplest is to head up Moorgate to the junction with Ropemaker Street, turn left into it and walk along to the end. Turn right into Milton Street then left into Chiswell Street, follow it along for a bit and you'll see the pub on your left at the corner. St. Paul's: leave the tube and head away from the Cathedral up St. Martin's Le Grand. Walk past the Museum of London up Aldersgate Street to the junction with Beech Street, turn right into Beech Street, under the Barbican and carry on until you see the pub.