On Saturday, 20 May 2017 16:07:36 UTC+1, R D S wrote:
Both tubes in a flourescent are flickering and won't light. Reading up
on the symptoms suggests the ballast at fault but there's two of them so
unlikely they've both failed?

As the only thing in there that there's only one of is a capacitor, is
it likely to be that at fault?

Some systems have the tubes in series.