The resulting 1966 contract addressed major grievances of GPs and provided for better equipped and better staffed premises (subsidised by the state), greater practitioner autonomy, a basic practice allowance for any GP principal with a list of more than 1000 patients, and pension provisions. Fees for service were introduced for interventions related to the prevention of disease. There was considerable pressure from doctors for the introduction of charges to patients but the Minister, Kenneth Robinson and the leadership of the BMA resisted this. Despite some changes, the capitation principle and the pool survived. The new payment system, known as the red book, allowed doctors to claim back from the NHS 70% of staff costs and 100% of the cost of their premises. Maternity Services and contraception were optional services which attracted additional payments. GPs were allowed to practise privately, to hold part-time hospital or other appointments within the NHS, to work in industry or for an insurance company, although few did very much private work.