bobward
You can take most of the ground display weapon loads seen at Farnborough, and other similar gatherings, with a very large pinch of salt. Choose just a few from the range displayed and that might be a possible flight configuration. Apart from the total mass to be lifted and the levels of drag induced the release characteristics of weapons require stringent limitations to be applied that invariably limit what else can be carried alongside.
Initially, there was an intention to field an Air-to-Air 2" Rocket Pack for Lightnings, interchangeable with the Missile Pack, this was quickly dropped following 'exciting' flight trials!
Everyone understood that jettisoning the 'Overburgers' with fuel inside would possibly break the wings. Hence, the limitation to jettison only when empty. Allegedly, a ground trial at Warton jettisoning Full Over-Wing Tanks broke both wing spars and then the Tanks just fell off. Not sure what drove anyone to try this without the benefit of aerodynamic separation, almost a bound to happen scenario!
The Overburgers were rarely fitted, being confined to long distance ferry sorties, eg UK to Singapore or similar.
lm