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All of the London circuits (and Cyclopark) are big ring (53) only. If you've got a semi-compact or a smaller it's even easier.
Main problem as mentioned above is potential to drop chains or a slow shift. You want to be focusing on position and response to others rather than shifting your front derailleur.
How much climbing in a cat 4 crit at hog hill?
Is it a small chain ring job even if running a compact?