The general stats from that UK site are almost identical to Australian racing.
e.g. Favs are placed 61% of the time, same as here in Aust according to Gary Robinson's book on Favs.
The average div is also the same.

The question of Maidens winning their next race after a win is pretty terrible because they are going up in class after their maiden win.
Their SR is less than the overall last start winner stat average of 20% it also generates a level stakes loss.

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Cheers.