An appalled mum filmed human waste flowing through a new-build family estate – which developers have blamed on nappies being flushed down the toilet. Leigh Hawkins says excrement, soiled loo roll and other potentially harmful mess have been repeatedly pumping through the streets of Whitstable Heights, attracting rats to her home. The mum-of-two, who lives next to the unfinished housing project off the Old Thanet Way on the edge of the coastal town, says the problem has plagued residents since construction began in 2019. Developer Hyde Homes apologised this week and says it is “advising” people…