Hi Richard,
If you have a MicroSD to USB or any other means to plug a microSD you could try a full reinstall
Step 1) download "Full Installation Image" from
http://pilotaware.lode.co.uk Step 2) Take the Micro SD card out the PAW located at the back and plug it into a computer,
Step 3) Click accept at the bottom of here and install SDFormatter
https://www.sdcard.org/downloads/formatter_4/eula_windows/index.htmlStep 4) Run SDFormatter and select the Drive letter that is the MicroSD (if you open up my computer it should be called Recovery and then a drive letter next to it)
Step 5) Open up the PilotAware.zip file, open up the PilotAware.2016.1201 folder and copy everything inside that folder onto the MicroSD card.
Step 6) Plug it back into the PAW and it will take 10-20 minutes to automatically reinstall. You can watch the progress by plugging a HDMI lead into the PAW and then into a TV or monitor but this isn't necessary