For gravel riding on actual gravel (probably not a lot of that in the UK!) you're better off with a low BB, because it lowers the centre of gravity and the bike feels much more stable when you corner.
If you race CX courses with a lot of obstacles and off-camber corners you may want a higher BB for clearance.
Darren Baum, Sacha White and other framebuilders use low BBs. It makes a lot of sense IMHO, I rode a CX Speedvagen (race geo, but 75mm BB drop) on frozen grus and it felt much better than the more traditional euro geometry cross bike I rode at the time.
.. and Andyp,
Thanks for the info. Interesting!
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