The whole of my garden is a patio, which is 12.5 by 10.5 metres. I intend to resurface my patio. I would like my patio to include a 25cm border of bricks and the remainder of the patio inside the border to be covered with paving slabs. The bricks I will use for the border are 25 cm x 25 cm and the paving slabs I will use for the remainder are 30 cm x 20 cm.