Success!
Using the latest method you describe there was another Epson-2710 file right at the top of the list which I installed and now it's working. Thanks for your help mate.
ii imagescan 3.63.0-1epson4linuxmint19 amd64 next generation image acquisition utilities
ii imagescan-plugin-gt-s650 1.0.2-1epson4linuxmint19 amd64 Image Scan v3 GT-S650 Interpreter Plugin
ii imagescan-plugin-networkscan 1.1.3-1epson4linuxmint19 amd64 Network scan plugin
ii imagescan-plugin-ocr-engine 1.0.2-1epson4linuxmint19 amd64 Image Scan v3 OCR Engine Plugin
sudo apt-get remove imagescan imagescan-plugin-gt-s650 imagescan-plugin-networkscan imagescan-plugin-ocr-engine
sudo dpkg --purge imagescan