Steepest Worked Gradient Today
 

The line between Cromford canal and Buxton claimed to be the steepest UK gradient worked by locomotive at 1:14 when it wound its way through Derbyshire, but since it's closure does anyone know what the current steepest gradient worked by locomotive in the UK is?

How about this ?

Docklands light railway, 1 in 17 (5.88 %) at the entrance to the tunnel from the original London and Blackwall railway viaduct to the tunnel to Bank.

On the "proper" railway it's probably the Lickey incline.The climb is a gradient of 1-in-37.7 (2.65%) for a continuous distance of two miles (3.2 km).

Many thanks Philip, my eldest and I were discussing but she didn't know the answer.
Not bad considering she's In rail Operations Management.

Mersey Railway 1 in 27

There is a list in Wikipedia (probably incomplete) : https://en.wikipedia.org/wiki/Grade_(slope)#Railways