We have received this from the East Suffolk Emergency Planning Officer:

Please note as you update review your plans, local signposting on village websites etc, the Environment Agency Floodline no from this month is 0345 988 1188. This affects both fluvial and coastal risk areas in particular.
With nearly 90% of callers using the 0345 number, from early April 2018 Floodline will operate with the 0345 number only.  The 0845 number will be deactivated and any calls made to this number beyond this time will receive a recorded message asking them to redial the 0345 version.