Looking across the region, there seems to have been a patch of very low dew points approximately correlating to the dissipating precip south and west of the M25. For example, my temperature is around -0.8, but my DP is around -6. With such a low relative humidity, I guess this could have been inhibiting precipitation from reaching us, however it does look to increase soon to become more confined to the SW, which may help if any showers do encroach later on... by which time they will have died off, knowing our luck!