Although successful at this hospital, the two tier system would be expensive under the Royal College of Obstetricians' guidelines of one consultant to a maximum of 500 deliveries. An equal mixture of two tier and three tier systems might be the best solution for patient care and training of junior doctors.
A total of 400 children with neurological disorders were studied to ascertain whether they had been immunised against pertussis, the reasons for non-immunisation, and the "validity" of these reasons, as judged by interpretation of the recommendations of the Department of Health and Social Security. The results for this group were compared with those for a group of 400 aged matched controls. The study group had a significantly lower rate of immunisation than controls (p < 001); rates for both groups fell sharply after 1975. A total of 192 study patients and 186 controls were not immunised. Those children with cere-
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