Kaka Tim
Half Arsed and Slapdash till I Die
Quadrophenia is at the low end of an average budget for a mainstream British film of the late 70s, which (not counting more expensive US co-productions) would have been between 2 and 5 million. It being a period film shot on location, money would have been tight.
Due to its controversial subject matter Scum was a British independent film, financed by a production company behind z-grade exploitation and avant garde films. It's not representative of average budgets for British mainstream films at the time and was closer to "no-budget" than low budget.
And Scum would have been cheaper to film - studio set, no period detail to worry about, smaller cast, no smashed up scooters, dont have to pay for sting's hairdressing budget....