Some 50,000m? of T-Flow permeable paving from Brett Landscaping and Building Products is being laid for Mowlem at Sixfields in Northampton. The company claims that to date this is the largest European contract placed for permeable paving. Around 300 deliveries of T-flow are scheduled for the contract. T-Flow concrete permeable paving is designed as a block laying paving course for a total infiltration, part infiltration or no infiltration system.