I have just received an email that NLC were spotted in the vicinity of Abingdon this morning (19 July 2015) at around 02:30 and were visible for some time. I believe it was cloudy around Carshalton at that time. However as there was NLC this morning there is a possibility of NLC tonight or tomorrow morning before the clod rolls in. Suggest you observe 22:00 to midnight BST and 02:00 to 04:00 to see them if they occur. They will be early in the evening and late in the morning
Good Observing
John Murrell