I might add that the BBC site doesn't have the same information as TENDRING DISTRICT COUNCIL even though they appear to be quoting the same source i.e. UK Hydrographic Office (UKHO):

0427 High 4.3
1022 Low 1.0
1646 High 4.4
2306 Low 0.6

The above is what the BBC are saying is UK Hydrographic Office (UKHO) data for the 18th JULY 2010.

TENDRING DISTRICT COUNCIL has a different version of UK Hydrographic Office (UKHO) data for 18th JULY 2010:

HIGH TIDE: 04.17am 16.37pm

Now why would that be?