After struggling with the hardware for a long time I have completely replaced the weather station again.
It is now a Davis Vantage Vue, installed on 22/12/2017 Replacing an Oregon Scientific WMR180 and has been uploading good readings since 3/1/2018 using a belfryboy datalogger.
The station is monitored by a Raspberry Pi 3 with SSD and Raspberry Pi camera
The readings are forwarded by Cumulus MX
The webcam is captured every minute by software on the Pi