 Trials with Brill clay in 1883 proved positive, and in April 1885 Jones sought estimates for machinery and labour necessary to produce 10 million bricks a year.It was decided that 5 million bricks per year was a realistic figure, with bricks to be manufactured in kilns between Brill and Wood Siding stations and shipped down the Tramway to the national network.Progress was slow and obstructed by the local authority.