asked the President of the Board of Trade whether he is aware that in many parts of the country constructional work is being seriously held up owing to a shortage of cement; that this state of affairs has been in existence for several months; that the result is a diminution of the number of men employed on constructional work, with increased unemployment and cost of work; and that the exports of cement from the United Kingdom for the past few months have been very great and the imports very small; and whether, in view of the fact that the export of coal is controlled on the grounds of protection for domestic industries, he will consider the possibility of applying to cement the same export regulations as exist in the case of coal?