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you will invariably end up riding a big chunk of Cornwall at some unsociable hour and in those scenarios it's very agreeable : )
I did Kernow & South West as my 600 qualifier for PBP in 2011 so I entered Cornwall around 11am and left at 4am-ish.
I did all the nice roads down through Launceston/Looe/Snozzle/Truro/etc to Penzance in daylight (getting to Marazion around dusk). It was then dark for the soul destroying slog back North through Newquay (1am-ish) and Camelford back up to Bude.
Less said about the second half (Taunton/Yeovil/Seaton/Exeter) the better. I think I only started to enjoy it when I stopped at an offy 100m short of the finish to grab some beers.
Proper type II fun though.
Any wait to enjoy this on London - LE - London