Looks like some remarkably dry air around. Via xc and NetWeather:
https://www.netweather.tv/live-weather/daily-top-20/minh
9% - Aonach Moor 11am
14% - London City Airport 2pm
And loads of 15%s, including:
Heathrow 21/-7 (4pm)
Fairford 23/-5 (4pm)
And even Southend is unusually dry: 18/-3 (24%)
15.8/8.8 here (63%).
EDIT: And 15% RH is more like you'd find on a plane - several hours of that really dries you out!
Originally Posted by: Retron