I've just emailed the Met Office as follows:
"Saturday 25 May - potentially urgent query.
Is the Met Office expecting a North Sea storm surge around this date?
Requiring sea defences to be readied and probable closure of the Thames
barrier. There's a full moon on Saturday. The five day forecast on BBC
Countryfile indicating north westerly gales or severe gales in the
northern North Sea on Friday, and the forecaster unexpectedly used the
word 'interesting'.
Mr A Haworth-Roberts"