I was the engineer on call for this issue, call received at 6.30pm, talked the customer through the process of relocating the rudder into its cup so they could continue navigating sooner if able to solve easily, about 10 mins later they informed me that they were unable to relocate the rudder, I advised them to moor up for the evening and we could go out to them first thing, they preferred a call out straight away as they had forgot to fill up with water and earlier that day one of them had fallen overboard and needed a shower, I made my way to them, on the way I purchases 3 bottles of mineral water, box of cherry bakewells, 2 cheesecakes and a packet of custard creams so they could at least have a cup of tea while the issue was being resolved, it took 10 mins to relocate, and I navigated the autherley narrows for them as the experience had knocked their confidence, they seemed very happy with the outcome, I arrived home at 9.30pm