Because I am a relative Linux novice I still make regular errors and cock ups. My solution was to install Virtualbox within Parrot 4.11 Kde Home. First off it performs very well indeed and I have experimented with various distros, Alpine,Guix,Devuan and a few others.
Not to be defeated I have installed the latest Parrot Kde Home iso and hey presto a fully functioning and slick environment. I can now fool about with Parrot to my hearts content and if the worst comes to pass, which has not yet happened, its just a quick reinstall.
So to conclude, the iso. image performs just like my host installation, whilst the dedicated Virtual image for some reason is a total let down.
This is not meant to be a criticism but merely an observation and I wonder if anybody else has had the same experience?
Anyway its back to the playground for me.