I think you are describing Bellmonte Road up Frodsham hill, it's a regular ride for me. It's still on the local club runs. It's not that steep, about 17-18% max.
Here's my bike at the top of the climb early this year. Note the MTB gearing to make things easy.
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I almost recognise that stretch of road. That last little bit was quite steep, especially when I was probably on a 44x18 bottom gear!