It is important to note that even in the 1940s the Tamil leadership had not taken the issue of Regional Councils and devolution of power to regions into their hands.
S.W.R.D. Bandaranaike offered a scheme of 60:40 as a basis of representation.
Bandaranaike-Chelvanayakam Pact, three decades prior to the 13th Amendment.
The UNP, which took to the streets in opposing the B-C Pact was forced to come to terms with the Federal Party in 1965. The Senanayake-Chelvanayakam Agreement of 1965
At the last minute the SLFP high command went back on this promise and the CP leadership succumbed to this betrayal
The conceptual origins of the Provincial Councils could be traced back to the Donoughmore Report in 1928. Conceptualizing it within the framework of local government, it presented a proposal to establish Provincial Councils to delegate certain administrative functions of the Central Government. More important is the rationale presented by the Donoughmore Commission for Provincial Council in 1928.
The argument in favour of the establishment of a Provincial Council in each Province is that such a scheme might result in a large part of administrative work now carried out in the Legislative Council coming into the hands of persons permanently resided in the country districts and thus more directly in contact with their needs; in the relief of the departments of the central government of much detailed work and in their being thereby set free to consider and advise on the larger affairs of the country: in the special views of the different races predominant in the different part of the Island having effects in the administration of these parts; in members of growing body of politically-minded persons in the country being placed in an honourable position to render real assistance in administration.