By cweller@thekmgroup.co.uk (Chantal Weller) A “substantial sinkhole” three to four metres deep has opened up in a field – and is being given a wide berth by walkers. The void has been spotted by those who use the route in Deal, on a piece of land which sits adjacent to Northbourne Road. Michael Winsor spotted the missing piece of land last week and said he avoided it when walking past. “I don’t really know why it occurred but my guess was due to recent heavy rainfall that a hollow had formed and then collapsed,” he said. “It isn’t on a public footpath but it is the edge of a field that a lot …