Getting to the Show
Please don't try to drive to the Lord Mayor's Show. All the roads are closed and the parking spaces suspended. Unfortunately this means that buses aren't great either, but the processional route is very well served by tube and train stations, there are good options for walking in and if you come on your bike there is a car-free city to enjoy.
Several tube stations will bring you out right on the processional route: St Pauls on the outward leg, Blackfriars or Mansion House on the return leg, Bank junction right in the heart of everything and under the BBC cameras. All of these will be very busy, but any of the other stations shown below are within walking distance of the procession. None are more than 10-15 minutes away, and your walk is made a lot easier by the absence of traffic.
Walking to the Show
If you don't mind walking a bit further, there is a very nice route in from the South Bank over the Millennium Bridge and up to St Paul's. Waterloo, Borough and London Bridge stations will put you nearby. You can also walk down from Old Street in the north or the Strand in the west but you may have to detour around the gathering procession. Blackfriars bridges is closed all day and Southwark Bridge a bit cut off, so those are also good options.
Please be aware that as the start time approaches it will get very difficult to cross the processional route. Leave plenty of time.
Getting here by bike
You will find that the City is a very nice place to ride a bike on the day of the Show. There is no traffic and you're quite likely to share the street with a brass band or giant fish. It is best to avoid the areas around London Wall and West Smithfield where the procession is drawn up and security very tight. The police are very likely to send you round another way. At lunchtime you will also find the area south of Aldwych and around the Temple very congested.
Road closures mean that Santander Bike stands cannot be emptied or replenished. Many of the stands near the route are closed for the day, which means the rented bikes are sadly not a very reliable way to get to the Show.
Getting here by bus
The Show is not good for buses. They are diverted around the City for most of the day and the nearest you can get is Liverpool Street, Old Street or Kingsway. Unless you plan to walk in from the boundary, your best bet is to get on the tube when you can.
Getting here by river
The river bus pier at Blackfriars is ideally placed for the return leg of the Show, from 1.15 onwards. The Bankside pier is also quite handy for the Millennium Bridge, which will take you straight to St Paul's for the outward procession and music the family fun of the Paternoster Square Show Zone.
Getting here by car
No chance. Sorry. The security cordon around the Show is very tight and nobody is allowed to drive into the area. The only exception is made for disabled people with a blue badge, who can request a parking permit for the Victoria Embankment. Please see the access page for details and application form.