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I've driven through Saint-Lary-Soulan a few times using the Aragnouet-Bielsa tunnel to get to Ainsa to go MTBing. I remember seeing signs on the D929 near Arreau for a turning west towards Col d'Aspin and Tourmalet, assumed that's where they'd be going when I heard the route would be in the area.
The road up to the tunnel would be a pretty good finishing climb, but they probably wouldn't get to close it for a race since there isn't an alternative route to access the villages further up the valley than SLS.
C'van 15:19, 30km/hr 17:18, 28km/hr 17:27 and 36 km/hr 17:39 - all local times, so subtract an hour for UK.
Be interesting to see what the actual pace is - it's either up or down with no flat for 65k!