I suppose that the occlusion straddled across central England in the midnight analysis (fig 1) could be classified as a ‘cold’ occlusion, because it’s certainly brought lower dew point air south and west across the UK today. The cold front that preceded it actually raised dew points as it came south yesterday evening as far as I can see. I see the occlusion/trough lying from Tiree southeastward to Lincoln as the real cold front, although there is little or no weather on it (fig 3), but it does separate the 6 to 8°C dew points in the west from the +1 to -2°C dew points further east and north (fig 2).
Neither the IR satellite image or the weather radar provide any good evidence of any triple point system centred over North Norfolk at midnight, with the bulk of the rain having transferred into the continent during the previous evening (figs 3 & 4).
Looks like I’ve lost this particular argument though, because the Deutscher Wetterdienst midnight analysis confirms the Met Office analysis (fig 4), low Peter turned out to be rather an unusual synoptic feature.