Sam gave me the four tracks for the day to stitch up and here is some data on his hours.
5 best 3600 second (at least) average = 46.48km/h [25.10Knots]
3600 second run n°1 = 48.36km/h [26.11Knots] (48,358.2 m. in 3,600.000 s.)
3600 second run n°2 = 47.27km/h [25.52Knots] (47,265.8 m. in 3,600.000 s.)
3600 second run n°3 = 46.77km/h [25.26Knots] (46,774.5 m. in 3,600.000 s.)
3600 second run n°4 = 45.08km/h [24.34Knots] (45,082.5 m. in 3,600.000 s.)
3600 second run n°5 = 44.90km/h [24.24Knots] (44,901.1 m. in 3,600.000 s.)
3600 second run n°6 = 43.24km/h [23.35Knots] (43,242.3 m. in 3,600.000 s.)
3600 second run n°7 = 39.28km/h [21.21Knots] (39,284.4 m. in 3,600.000 s.)
The total distance is 404.647 Km.
Huge effort Sammy, well done mate!