Thanks Peter. I will try this. I managed to get it to work eventually, but I found I was still getting the flare (very slightly over the solid object. I will now follow your instructions. I have a feeling it was because I did not Position the Lens Flare an RGB to obscure the light.
The only Way I did get it to work was by putting the same video on v2. But make v1 video an alpha channel. Obscuration Type pop-up still to RGB. This made the lens disappear behind the object! Not sure if that makes sense.