Re: So, £270M for a diary!?
"why in 2017 are people still able to run a viable business developing diaries?"
It sounds more like an unviable business failing to develop diaries.
But in answer to your question, from extensive experience around the courts in the past, looking at it as a diary is probably the wrong approach. Think in terms more of a production planning system where some stages are unpredictable in duration and where the resources needed are being shared with other production processes, some of them quite some distance away.