I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission requirements unknown.
There's a little spot on the waterside path (indicated by the marker) which is ok at quiet times (when the museum is closed!) At other times it is likely to be too busy.
As well as views of the waterways museum, there are good views of the Ship Canal, across to Liverpool, and of occasional interesting boats.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 21/07/2019. It remains the responsibility of any pilot to check for any changes before flying at the same location.