I had to delete all the apps one by one, checking to see where the issue was.
I got down to bitcoin and blockchain explorer, and still there was an issue with RPC connection to bitcoin app.
I think if there was a bitcoin.conf file to alter, I could have corrected the password and user name in there, but I couldn’t find it. ( Closest was a .env file that looked to be importing from somewhere perhaps? )
Anyway, I backed up my channels, deleted all the apps one at a time, then reloaded them.
If you do that, make sure you have your seed and channel backup ready to re-install after the initial blockchain downloaad.
It was a right pain in the *rse, and time consuming for what should be an easy fix, but it was the only way I could work it out as a relatively non-tech operator.