I don't know, Delatron ~ looks like the metoffice are 'covering all bases' with their latest Outlook into next month..
UK Outlook for Monday 30 Apr 2018 to Wednesday 9 May 2018:
Northern and western parts of the UK are likely to be mainly dry and bright on Monday, apart from the odd shower. In the south and east significant rainfall is possible accompanied by stronger winds. However, there is uncertainty about the time and place of the heavy rain and some areas could get a sunny day. Temperatures will be a little below average and cold enough for a slight overnight frost in the north and north-west. Changeable weather will continue during the first few days of May with brisk winds and spells of rain at times, but a few drier and sunnier spells too. Temperatures will tend to recover to near normal but at times it will feel colder, so overnight frost in the north remains possible.
UK Outlook for Thursday 10 May 2018 to Thursday 24 May 2018:
A dry and bright spell of weather with light winds may develop at the start of this period especially in the north, bringing slightly above-average temperatures. However, confidence in this aspect of the forecast is low. Mixed weather with showers or longer periods of rain remain possible. In fact, there is a signal for a greater number of heavy showers than usual in the south, perhaps including thunder at times. Where the weather does becomes wet and windy, temperatures will drop down to average or a little below.