Some met reports from around the uk at 23:30 showing high pressure :
CARDIFF EGFF 122320Z 04007KT 9999 BKN033 05/02 Q1041
BIRMINGHAM INTERNATIONAL EGBB 122320Z 36005KT 9999 OVC030 05/03 Q1042
MANCHESTER EGCC 122320Z VRB02KT CAVOK M01/M02 Q1043 NOSIG
and this from the BBC weather website
"The highest sea level pressure figures recorded in the world are generally from Siberia. A figure of 1075.2 millibars (31.75 inches of mercury) was recorded on 14 January, 1893 at Irkutsk, Siberia. The highest recorded air pressure, adjusted to sea-level, was 1083.8 millibars (32 inches of mercury) at Agata, Siberia, on 31 December 1968."