I’m wondering whether I should - so far I have tried to have the matter dealt with informally, but things improve for a couple of weeks then deteriorate again. The issues are with a colleague who I have to work with but don’t directly manage. This person is obstructive, passive aggressive, doesn’t do as asked and basically does what they want to, a lot of it poorly/inconsistently. I haven’t dealt with it formally as they are a long-standing member of staff of retirement age and it didn’t sit well with me. Recently this person complained about me and said they would leave if they had to report to me - this is a distinct possibility due to restructuring. Which is rich as there are no issues with anyone else, I see that as a first salvo because they know they have been rumbled. The person is manipulative and plays people but is as nice as pie and very co-operative with those they consider important. I feel I’m being bullied tbh by the treatment I am receiving.