If you plan to use the M4 to come to the race, please check your route in advance as there are ongoing roadworks. See https://highwaysengland.co.uk/projects/m4-junctions-3-12-smart-motorway/ (scroll down to Planned Roadworks section).
The motorway was fully closed last weekend, although there seem to be NO plans for it to be fully closed (apart from some sliproads overnight/8pm-6am) this weekend.
Also note that Hammersmith Bridge is closed to vehicles long-term.
The Fours Head 