It is entirely undesirable that on modern housing estates only one type of citizen should live,' he argued. 'If we are to enable citizens to lead a full life, if they are each to be aware of the problems of their neighbours, then they should all be drawn from different sectors of the community. We should try to introduce what was always the lovely feature of English and Welsh villages, where the doctor, the grocer, the butcher and the farm labourer all lived in the same street.