I don’t own a display-o-tron. I was going by this.
Display-o-Tron HAT at Raspberry Pi GPIO Pinout
Appears downgrade to Buster (Lite) image 20200213:
PRETTY_NAME="Raspbian GNU/Linux 10 (buster)"
NAME="Raspbian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster
ID=raspbian
ID_LIKE=debian
Re-install of Pimoroni script and reboot have resolved the issue. Thanks for all your help, soldering was okay after all.