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Apart from the slight kink on your map at Stanwell where I went straight on, that is pretty much the route I took. The road network over that way is as @mespilus described. There’s not really much out there except depots and support industries for Heathrow, probably why there are no small roads.
That bit of road mespilus described where where the underlying concrete slabs have moved was pretty dreadful. Luckily it was fairly quiet.
RWGPS gave me this