The letter went on to say: “Retired 1989 but possibly still retained. hese people never retire. Mr Machin, understand you are involved with, etc, a word to the wise, etc!”Elizabeth-Ann Machin, who lives in a house on the estate, said she felt scared when she read the letter allegedly sent by Mr Campbell. Mrs Machin told Kilmarnock Sheriff Court that she saw it as a death threat against her husband, adding: “I was very upset. I was frightened he would get killed or something. My first reaction was, we’ll have to move. Can’t live here any more – this is dangerous.”“I was very ill at the time and was having counselling, still having counselling. It doesn’t go away. It’s every day. I can’t bear it. Just the worry. The worry’s terrible. “It was a roundabout way of saying, ‘Don’t mess with me’.”Mrs Machin, 70, who was recovering from cancer, said she discussed the letter with her husband, adding: “I think he said we can ignore it, confront him or we can phone the police.”Her husband, a 72-year-old retired a business consultant, said: “I took it as particularly threatening and I know it had an effect on my wife.It was very similar to a letter received by one of my neighbours previously.” He told prosecutor Stephanie Macdonald he thought Mr Campbell was responsible and added: “I have no doubt he sent it to me.”Mr Machin, who had CCTV installed after the incident agreed with defence counsel Keith Stewart he had sent numerous emails to RBS and house builder Persimmon about their “unhealthy relationship” with Mr Campbell’s company, Duffield Morgan.Mr Machin also wrote six times to Police Scotland’s chief constable asking why the investigation into the letters was taking so long and referred to police officers using the golf course at Rowallan.The disputes were discussed at residents meetings but Mr Machin said Mr Campbell was “divisive”.He went on: “I told him he was divisive. His whole approach to the homeowners was divisive.” Mr Campbell would carry out “continual patrols past our house and others in his [Land Rover] Defender.”Mr Campbell, of Waterside, Ayrshire, denies threatening or abusive behaviour by sending letters to the couple and to resident Alistair Dickson, between January 2013 and July 2014. The trial was adjourned. Jon Pertwee as Worzel Gummidge Credit:Rex A “Worzel Gummidge” laird sent his tenants letters warning he was a retired secret agent trained to kill in an apparent bid to force them off his land, a court heard.Niall Campbell, who owns Rowallan Castle and the estate near Kilmaurs, East Ayrshire, is said to have sent an anonymous message which said: “1972 – Recruited MI5 field officer. 1975 – Saudi, Lebanon, Yemen. 1992 – honoured, list non-disclosed.”The letter, partially typed and handwritten, said Mr Campbell liked to appear “Worzel Gummidge- like” but was “ruthless and licensed to carry side arms,” the court heard.Worzel Gummidge – a scarecrow character in a series of childrens books from the 1930s by the novelist Barbara Euphan Todd – would come to life but then go into a sulk and become inanimate when being mischievous. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.