The answer is that has quite an impact on schedules. LC are allowed a 20 minute turnaround time at Inverness, and are on quite tight duty times and rest times, so if they are held up at Inverness on the way to somewhere, where they arrive late, the next day's report time may be delayed to allow sufficient rest.
The ILS at inverness is pretty neat, but the money might have been better spent on a radar. The number of divertions due to weather are fairly low, but with the increase in traffic, particularly in that one period in the afternoon, around 4pm I think, the instances of holding are more frequent. Alternatively, the companies flying into Inverness could, perhaps, look at their schedules to try to avoid congestion. I think LC have about 3 or 4 aircraft in at that 4pm time: maybe if they spread them throughout the afternoon, when Inverness is pretty quiet, that would help. Fat chance.