This line has not been walked yet (and is also not yet opened). Here’s the itinerary when we do it.

4 or 5 Days – 90 Miles

Day 1: Essex

Shenfield		
Brentwood	2.1m
Harold Wood	6.4m
Gidea Park	8.2m
Romford		9.4m
Chadwell Heath	12m
Goodmayes	13.1m
Seven Kings	13.7m
Ilford		15m
Manor Park	16.3m
Forest Gate	17.3m
Maryland	18.1m
Straford	18.8m


Day 2: South-East to West

Abbey Wood
Woolwich	2.6m
Custom House	5.7m
Canary Wharf	7.9m
Whitechapel	10.4m
Liverpool St	11.4m
Farringdon	12.6m
Tottenham Ct Rd	13.8m
Bond Street	14.6m
Paddington	16m
Acton Main Line	20.8m


Day 3: West to Heathrow

Acton Main Line
Ealing Broadway	1.8m	
West Ealing	2.7m
Hanwell		3.9m
Southall	6.1m
Hayes&Harl'ton	8.5m
Heathrow Tunnel	11.4m 
Heathrow Ctrl	BUS
Heathrow Tunnel	BUS
Heathrow T4	15.2m	
Heathrow T5	18.5m
West Drayton	22.2m


Day 4: Berkshire

West:
West Drayton
Iver		2.3m 	
Langley		4.5m	
Slough		6.9m	
Burnham		9.6m	
Taplow		11.5m	
Maidenhead	12.6m	
Twyford		20.6m	
Reading		26.4m