Aquaventure Scuba Club, Bristol. "sinking to new levels of professionalism"

Tide Times

Easy 6 day predictor site from the hydrographic office

To help with personal trip planning you can't get much better than Belfield tide plotter, inexpensive and comprehensive software covering tides for the next 3 years

Understanding the phases of the moon and how they affect spring and neap tides is often crucial to dive planning. In general spring tides give the greatest range of tidal movement and therfore mostly more current. Neaps provide the least tidal range and less current. There are two excellent sites to help understand this:

Understanding Phases of the moon

How these phases affect tides