Tide times in the UK vary around the coast depending on the position of the moon, sun and various other influences. Using tide tables, generated from tidal prediction data, it is possible to see where and when a high tide will occur on any date at a given location.
Most tide tables use Universal Time so for summer sailing you will need to add 1 hour for BST.
For HW times at Trent Falls add 50 mins. to Albert Dock HW
For HW times at Torksey add 3hours 45mins. to Albert Dock HW
For HW times at Boston add 40 mins. to Albert Dock HW
These times can vary depending upon whether spring or neap tides.
It is always advisable to check with lock keepers where you can.