I learnt the art of the rapid changedown when driving up Coombe Bottom (a bit north of Shere, Surrey)in the family 1100..5 up.. there is a left hand hairpin up about 1 in 4 slope at the top. If you missed the gear change it was an almost impossible wheel spinning hill start, or roll back a few yards and try again.
I got stuck last week at the end of a rough farm drive trying to pull a camper up a ridiculously small slope. Wheelspin and burnt rubber.