Tide tables, including ormering tides and the times that the Lihou Island causeway is open.
Follow the link below to find out tide times and heights. Tide times are provided in Greenwich Mean Time (GMT). So, they can be used as read until 26th March 2017 and from 28th October 2017 onwards. However, between those dates you will need to add an hour to the high/low tide times to take into account British Summer Time (BST).
The Lihou Island causeway opening times are published in BST between 26th March and 28th October, so visitors to the island do not need to add on an extra hour to the times listed.