One also needs to put deficits in context. Obvious, I know, but worth emphasising.
A deficit of £663m for a company with a market capitalisation of £929m is one thing (CLLN).
A deficit of £1,137m for a company with a market capitalisation of £12,470m is quite another (Centrica).
Market capitalisation may not be the best comparator, but it illustrates the point.
Totally agree 77ss, the relative size of the problem is clearly an important consideration