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Annual Tide Tables for Walton-on-the-Naze, Margate, Southend-on-Sea, Coryton, Tilbury, North Woolwich and London Bridge can be found here on the Port of London website.
Our thanks to them for the service they offer to thousands of people using the waters of the Thames Estuary.

As you can see from the table below, Walton is 5 minutes earlier than Harwich.

Tidal Differences on Harwich. 51.9500° N, 1.2833° E

Aldeburgh Beach - 0105   Manningtree + 0040
Aldeburgh - Slaughden Quay + 0115   Milton Creek + 0055
Bench Head + 0020   Mistley + 0035
Bradwell Quay + 0030   Orford Bar - 0025
Brightlingsea + 0020   Orford Quay + 0020
Burnham-on-Crouch + 0040   Paglesham + 0030
Colchester + 0035   Pinmill + 0010
Colne Point 0000   Queenborough + 0055
Deben Bar - 0010   Rochester + 0100
Dover - 0045   Snape Bridge + 0145
Erith + 0120   Southend Pier + 0040
Fambridge + 0040   Southwold - 0150
Felixstowe Pier - 0015   Stone Point 0000
Gravesend + 0105   Tollesbury + 0040
Great Yarmouth - 0300   Waldringfield + 0020
Harty Ferry + 0045   Walton-on-Naze Pier - 0005
Havengore Creek + 0025   West Mersea + 0030
Heybridge Basin + 0050   Whitaker Beacon + 0010
Holehaven + 0050   Whitstable + 0040
Hullbridge + 0045   Wivenhoe + 0025
Ipswich + 0035   Woodbridge Town + 0040
Lowestoft - 0220   Wrabness + 0025
Maldon + 0055      
[ 2003 • 2004 • 2005 tide tables no longer available thanks to the UKHO - see below]

THESE TIDE TABLES HAVE BEEN REMOVED BY ORDER OF THE UNITED KINGDOM HYDROGRAPHIC OFFICE AS THEY SAY THAT THE OUTDATED HARMONICS PART OF THE CALCULATION USED IS SUBJECT TO CROWN COPYWRITE.

THE TIDE TABLES THAT WERE REPRODUCED HERE DID NOT ORIGINATE FROM THE UK.

BECAUSE THE TIDAL DATA WAS CALCULATED BY A FOREIGN GOVERNMENT DEPARTMENT, AND THAT DEPARTMENT IS FUNDED BY TAX PAYERS, THEIR TIDAL DATA FOR THE WHOLE WORLD IS AVAILABLE, FREE FOR NON-COMMERCIAL USE.

THIS WEBSITE IS NON-PROFIT MAKING AND DOES NOT HAVE THE FUNDS TO PAY FOR UKHO PROUDMAN CROWN COPYWRITE DATA.

THE TABLES SHOWN ON THIS WEBSITE WERE INTENDED FOR FUTURE PLANNING OF LOCAL REGATTAS, NOT TO OPERATE A COMMERCIAL SERVICE.

SUCH HEAVY HANDED REACTION IS TYPICAL OF THE CONCERTED EFFORTS OF THE UK ADMIN TO DECIMATE THE FISHING INDUSTRY, OUR MERCHANT FLEET, TRINITY HOUSE, THE COASTGUARDS AND TO WATCH THE EROSION OF OUR COAST LINE.

COULD IT BE THE HYDROGRAPHIC OFFICE IS NEXT TO GO - TO BE REPLACED BY A SATALLITE IMAGE?

This data is not calculated by Proudman and uses another algorithm. The data is offered WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  The author assumes no liability for damages arising from use of these predictions.  They are not certified to be correct, and they do not incorporate the effects of atmospheric pressure, storm surges, seismic events, continental drift, or changes in global sea level.
When atmospheric pressure is increased, sea level is lowered and vice versa. A variation of 1" Hg [approx 34millibars] in the height of the barometer causes a variation of about 12" [0.3m] in the height of sea level.
It is not unusual for storm surges to cause tides to vary by more than a metre from predictions in the Thames Estuary and times to vary by 20minutes or more. Such changes cause sea levels to oscillate between high and low level, gradually dying out as conditions become stable again.