I'd imagine there's still a signigicant enough number of cars travelling to Sandringham as well with additional things that need to be transported for her right?
There probably is, but the only thing that's going in the helicopter is the queen and maybe a couple of companions - all the rest will travel by road anyway regardless of how she gets there. The only comparison is the Bentley vs. the helicopter.
I'd imagine there's still a signigicant enough number of cars travelling to Sandringham as well with additional things that need to be transported for her right?