It's worth pointing out that yesterday provided exceptional Cb activity with hail stones measured at 15mm in diameter at the Met Office in Bracknell (15 miles west of LHR). Yesterday was not a day to discover what it's like to reach Aa in the midst of a 'red return' with Mod/Sev Continuous Turbulence whilst your leading edges and fan blades are being given that 'brushed metal' look that our wives keep asking for in our kitchen appliances these days....