"JPs are sometimes rung all hours of the day and night and so really being a JP is a co-operation between two people," he said.
Having three mayors in attendance at his retirement function - Tracey Collis, (2016 to present), Maureen Reynolds, (1998-2010) and Bill Bly (1995-1998, showed the high esteem in which Trotter was held, Tom said.
"JP retirement is relatively new, something not forced on anyone, but we all will take the decision to retire at sometime," Castles said. "JP retired status isn't a decision taken lightly and Bob has taken a couple of months to come to this."
Ralph Mountford, also a retired JP, said in a letter to Trotter, "I wish I had done this years ago, if only I'd known being a retired JP was this good."
Trotter said there had been some funny, difficult and interesting things he had to deal with during his time as a JP.
Changes are also coming for the delivery of JP services in Dannevirke, Castles explained.
"We are going to establish a JP service desk in Dannevirke, based in the Tararua District Council offices and it will be open once a fortnight, between noon and 2pm, probably on a Wednesday," he said.
"These seem to be working in other areas and we hope to get it up and running in the next few weeks."
However, Castles said the service wouldn't be relying on the mayor and the two other JPs on the council staff to man the desk.
"We're doing this to take some of the pressure off JPs in Dannevirke, but if we don't get the support of JPs to help operate the service desk, we'll abandon the plan," he said.
"We hope to get the service desk up and running in the next few weeks, but if someone wants a document signed urgently, that can still be done."