Selecting analogues for 30-day periods, and pattern sequences
for 5-day periods during March and April, then using best-fit years,
we get the following for May 2004:

Mean sea-level pressure pattern over the British Isles:
almost uniform, weakly NE-ly in the south, weakly SW-ly
in the north

Mean pressure anomaly pattern over the British Isles:
easterly

CET: +0.4 degC
E&W RR: 104%
E&W sss: 106%

Verification of April's Not The Long Range Forecast
Sea-level pressure pattern:
Actual: westerly cyclonic
Forecast: westerly, weakly cyclonic

Anomaly pattern:
Actual: W-NW cyclonic
Forecast: W-NW, weakly cyclonic

CET
Forecast +0.2 degC
Actual +1.4 degC

Rainfall
Forecast 100%
Actual 137%

Sunshine
Forecast 90%
Actual 93%

Philip Eden