I parked on Parsonage Road, Widnes. A public footpath runs west under the two bridges, and there is an open concrete area on the river bank at https://what3words.com/camps.crowned.safely where I took off from.
Hazards: this site is clear of the Liverpool Airport flight restriction zone (at date of flying), but note that DJI's no-fly zone extends across much of the river (height limit of 60m imposed unless you arrange a temporary unlock). The footpath was not busy when I flew (Saturday morning). The take-off point is >150m clear from housing and from the road/rail bridges, but note there are commercial buildings and a school playing field nearby. Also: seagulls!
Land owner permission requirements unknown.
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Co-ordinates: 53.34928, -2.740083 • what3words: ///host.dreams.barn