Damning comments about one of Kent’s up-and-coming towns have sparked debate – after visitors called it dirty and run-down. Folkestone has seen its stock rise massively in recent years thanks to consistent investment from former Saga boss Sir Roger de Haan, which has included the regeneration of the Harbour Arm. Yet The Stade, a prime spot overlooking the harbour, was slated by a school tourist group last week – with both teachers and pupils quick to point out the various flaws they felt were being overlooked. It comes less than a month after The Sunday Times described the seaside town as the …