This was down to user error and not printer fault. I paused a job cuz of the noise and wanted to watch movie on tv. But noticed when paused the fan still spins and hot end is still hot so still got noise. I stopped the job that was paused and binned the partial printed model and offed the printer. Watched movie then turned printer on and set it off to print the same file again.
This is where something went wrong since i can see it didn't start the print from scratch but continued from where it left off but since the bed had been moved by taking plate off and back on along with missing partial print from before it for some reason hit the nozzle on the bed and dragged along nackering it.
The bed below the flexible magnetic build plate is solid steel so unmarked. Iv cleaned up the plate and pulled out the bits of filament shrapnel in it and flattened it out as much as i could. Its not totally flush with the bed but iv printed a few things today and they print fine and iv shifted the prints i do to the side that doesnt have the damage.
Ordered replacement plate.
Lesson learned, told kiddo not to start a job without asking me first cuZ the noise is distracting in the living room. Wont be using the pause function again, cancelling the job outright is easier and guarantees this situation don't crop up again.