Thank you for your questions.
We are currently working on expanding the amount of metadata available via the Data Services Platform which will include information on when the data was last updated.
Flood Map for Planning (Rivers and Sea) - Flood Zone 2 was last updated on the 7th February 2019 and is updated quarterly.
We currently have a recently updated datasets topic within the Announcements section of the forum which will advise our customer when a dataset is updated - to receive email notifications of these updates simply click the "follow" button within the Environment Agency datasets topic https://support.environment.data.gov.uk/hc/en-gb/articles/360000908738-Environment-Agency-datasets
The Flood Map for Planning (Rivers and Sea) dataset is published by the Environment Agency - here is a direct link to the data on data.gov.uk https://data.gov.uk/search?q=flood+map+for+planning+%28rivers+and+sea%29&filters%5Bpublisher%5D=Environment+Agency&filters%5Btopic%5D=&filters%5Bformat%5D=&sort=best
I hope this helps.