Thanks for confirming that, Graham. Not just me or my dirty glasses, then. The general whitish colour seems to indicate Saharan dust, i.e. large particles, rather than the yellowish brown one gets from small particles such as smoke.
Max here only 14.3°C, a long way down from the 23.7°C on Tuesday.
Tudor Hughes, Warlingham, NE Surrey, 557 ft, 170 m.