These tide times are generated by the jtides script: details at Flaterco.com.
Times are for nearest refence port, Immingham. Add 45 minutes for Overy Staithe. These tide times are automatically compensated
for BST (it says here!).
NB! Tidal predictions are just that: predictions! Don't expect them to be perfect in the real world. The predictions are mathematical and may have flaws, and real world tide times and heights are affected by wind and atmospheric pressure.