Good location for 20min FTP test - SW London / Surrey area

So as the title says does anyone know of any good places for an FTP test that has no junctions or traffic lights for a long stretch of road and is relatively flat? I'd be doing it very early to avoid traffic too.
Previously I have done testing in Richmond Park before its open to cars but the hills and roundabouts mess the rhythm and figures up it up a little.
Previously I have done testing in Richmond Park before its open to cars but the hills and roundabouts mess the rhythm and figures up it up a little.
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I'll take a look at the route you suggest. happy to hear any more suggestions on routes though...
Another one to do is start at Kingston bridge, go down the Hampton Court road and past Bushy to the big roundabout and turn right. Head towards Sunbury and down Lower Sunbury road/Thames street until you get to the Walton/Chertsey/Shepperton roundabout. Here's the route.
It's 6.1 miles; so you can just go around the roundabout and go back and do exactly the same route. It's usually very quiet, has one or two set of lights (one pedestrian, one traffic) prior to Sunbury. I'd still say go with Richmond though, unless you wish to head out down the A24 in Dorking where time-trials take place.