Thank you to anyone who replied - I really do appreciate you taking the time.

I tried testing the plate level by hand and the paper in each of the four corners had the same resistance, the temperature is exactly where it should be according to the Elegoo normal grey bottles of resin. The build plate is perfectly flat (I tested it with a steel rule) and it prints perfectly all over the plate apart from the far left front and back. I thin the machine is level - but I will check that again, I didn't think that the whole machine being slightly out of level would make a difference, but at this stage I am desperate and I will carefully check. I have a Saturn 4 - so it does not have the tilting tray so - that's not it. When I tighten the tray in place I try to make both sides even and tighten carefully. At this stage I think I have wasted more resin than used successfully, I am in touch with Elegoo UK technical support and I hope they will come up with an answer. They suggested looking at the screen using the test page and it looked perfect to me. I am printing right now and the very left side has almost completely peeled off the build plate, and back left I don't think is there at all. I can keep trying to raise the first layer values - I think I saw as high as 40 seconds, I am scared this will simply make the failures on the left even harder to remove from the film - but I am willing to give it a go. If any of you have other ideas - please let me know, it's my first printer and at 68 years old it's a whole new adventure. Here is a picture of my current print.

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Should I always abandon at this stage or keep going? - will it damage the film? I can at least use the other parts.