Here's the route:
Guide for Tour De France Stage 1 Recce
Addiscombe
Thornton Heath
Brixton
Elephant & Castle
Westmnster Bridge
Whitehall – St James Park
Northumberland Avenue
Victoria Embankment
Westminster Bridge
L @ RBT
L Chicheley Road
R Belvedere Road Pass London Eye, Festival Hall, TV Studios
L over Blackfriars Bridge
R Ludgate Hill pass St Pauls
Keep L Mansion House
King William Street
Keep L at Monument to Eastcheap
L to Byward Street & Tower Hill
R over Tower Bridge
L into Tooley Street, Jamiaca Road
A200 pass Cutty Sark
A206, Woolwich, Erith to Crayford
A2026 to Dartford
A226 to Swanscombe, Greenhithe
A226 to Rochester
Over A289
L into Strood
OVER BRIDGE (as cannot use Medway Tunnel) out of Rochester on A229
2nd R on unclassified roadto Wouldham
Through Wouldham
L to Burham
L onto A229
Straight run into Maidstone
R at main RBT to Tonbridge A26
Through East Barming, Wateringbury, Mereworth
L onto A228
To Tonbridge on A26 at RBT, through Hadlow
STRAIGHT on to Town Centre
Up through town to Bidborough Ridge (KOM 1)
Stay on A226 to Tunbridge Wells
Straight on to The Pantiles for Lunch
Out of Tunbridge Wells on A264 to Pembury
On to A228
TURN R approx 2 miles after crossing A21 into minor road at Colts Hill
Through matfield, Brenchley, Horsmonden
R on B2162 for approx ½ mile
L at Hazel Street minor road to A262
L on A262 to Goudhurst (KOM 2), Sissinghurst.
TURN R at Sissinghurst minor road to Colford
After ½ mile TURN L at Colford, through Fistenden, Clappers Hill to Tenterden
L on A28 to bethersden, Ashford
R at New Street Farm (2 miles from Bethersden) through Chilmington Green and Stubbs Cross Turn L then R (actual route is right through Ashford Town centre)
Over A2070
R to Buby
L at Chequertree to Broad Oak, Mersham
R on A20 to Sellindge
L in Sellindge, just before Motorway bridge to Hyham Hill
L on B2068, Farthing Common (KOM 3)
Follow B2068
Cross over A2 and L after approx 1 mile
STRAIGHT ON into Canterbury
L at RBT
SO next RBT
L next RBT
FINISH next to Sports Field before RBT (Harbledon)