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@gbj_tester
"all else being roughly equal"
R25 doesn't have streams of lorries going past, V718 doesn't have a handy cliff to drop off and not climb etc.
Better comparison might be to see what various people have done on H10/8 vs. H25/8, since the 25 course is two laps of the 10 plus an extra bit in the middle which is about as fast/slow as the other end of the track. My best 25 on there is 32s slower than 2.5 times my best 10. Should be plenty of data available, as I constantly meet the same people there in the many events on the Bentley courses.