One of the anemometer arms/cups has broken off. The breakage was noted over the weekend (1 August 2015) and a new part (N09QR) ordered. Repair expected to be completed by the end of the week. In the meantime, be aware we will be reporting wind speeds lower than actual.
Edit 2015-08-08: Repair completed Saturday 8 August 2015 in between 17:00 and 18:00 hrs BST.