It's 46 years since I had my first car, a 14-year-old Austin A50 (similarly equipped with unservoed drum brakes) but I don't remember there being a problem, and I certainly did hill starts in it. I didn't drive it over Hardknott although I did drive it in Guildford, which is almost as bad with the addition of a high proportion of drivers who are 90 in the shade.
I can still remember going over one of those passes - must have been in the 1970s as we had a Maxi - and the line of cars in front stopped for some reason going up a steep bit. One of the cars in the line, an elderly Wolseley 1500, suddenly rolled backwards, off the road and down a bank. Fortunately it soon hit a tree and the driver and passenger emerged uninjured. I've never forgotten the number - 273 GUM.
Clearly the brakes just wouldn't hold it, but if properly maintained and adjusted, I think 1950s brakes could hold a car on a hill facing either way.
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