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By slow I mean with a lot of time on the brakes. I thought you rode up Hardknott? If so you'll be familiar with extremes of Cumbrian the roads?
Coming down similar, narrow and twisting 20% roads that are open to traffic/sheep doesn't really let you do anything else unless you're on a mtb. Especially if your braking on carbon.
When @smallfurry is decending nordic moutains his speeds will be pretty high and that cool, high mountain airflow will help reduce heat buildup. On twisty small roads closer to sea level it's altogether different.
Descending Hardknott has popped Chinese carbon clinchers in the past.
At the risk if sounding like an asshole, but why would you ever want to descend slowly?