The sad case of me answering myself again! Oh well, I am an only child. sic!
Help came from various forums.
1. The following page has a section about installing the Intel driver. Added the repository and updated software.
Following this I could get in to the welcome login loop. i.e. I login and and I login and I login and I login.... OK, I did not really login 4 times in a row, but it would have kept on asking me to login and returns to the login screen. I much prefer this to the "blah ... low graphics mode ... blah" screen which just stares at me.
2. UbuntuNooBkjp gave some advice for the "loopy the loop" screen above.
does the trick together with a reboot.
sudo mv .Xauthority .XauthorityBak
I can now login and have a working desktop. CPU temp is back to 63 degrees. How am I ever gonna sort this out?!