You can see how over the last 25 years the analysis from the UKMO has got more and more complicated. This is more than likely due to the fact that the analysis is now done using NWPNWP Numerical weather prediction uses mathematical models of the atmosphere and oceans to predict the weather based on current weather conditions. fields and improved satellite imagery, rather than just surface observations anymore. It’s also shows the influence of Mr Occlusion over the last five years or so. Christmas day itself is usually a mobile affair and sometimes very cyclonic (1999 & 2013). Now and then its anticyclone (2006, 2008 & 2010) and one or two where its blocked (2009 & 2021). Just a rather cyclonic and boring SW’ly once again in 2022.