Can anyone help in what I need to do to remove Piaware but leave Dump1090 etc on my Pi?
Thanks in advance
If you are using the piaware sdcard image you are probably best starting over from scratch; start from a current jessie image.
No it was a plain SD card which I already had Dump1090 running and feeding FR24 & Planeplotter… I just want to remove the Flightware side of things.
Then you should reverse the install steps you took. The details of that depends on how you did the install.
maybe this does most of what you are looking for - by simply preventing piaware to run automatically after boot:
sudo update-rc.d piaware remove
shutdown -r now