My system works fine, but it appears that others are building my design too. And to assist in fault finding it is probably a good idea to document some signals  so other builders can compare their results with mine.

Oscillator

Oscillator output:

Video Section

Basis of the video signal is the 50Hz signal on U11-10. In the pictures below this is shown in the top, and used to sync the oscilloscope. Video signals were recorded with a LCD monitor connected.