tide time table.

This is the one i use Gaz can set it for any area
http://www.pol.ac.uk/ntslf/tides/?port=0007

put Sunnyrhyl.com into your search box.

http://www.sunnyrhyl.com/

i.e.
The "front end" of this forum has a link to a tide table for the month ahead.

Its down the right hand side, it defaults to Llandudno but you can re set for Holyhead for example, this is the one Kevb mentions above

http://www.pol.ac.uk/ntslf/tides/?port=0007

it serves me well enough and its free!