I got two of these (why didn't I get a spare ?) out of a skip some
years back (~2000).

One of them works fine but the other is an unwilling starter - switch
on/flash/switch off/ wait for a count of 8/repeat about 6 times for
light to start.

I tried changing the tubes around - no change. I put the bad one up
in the new workshop when it was initially wind and water tight, and
decided yesterday that it was time to change them over. I came to the
conclusion it was easier to change the modules rather than the whole
light, and the fault follows the modules.

I've got a basic concept of how these things work ( I am an
electronics engineer), but does anyone know what the starting
circuitry is likely to be like so that I can try and trace down the
faulty component? The electronics is all discrete components

Thanks
Rob