James Derrick
Hi,
This is a service road into a holiday park. It is not a public highway - and although access=destination could be added, I'd suggest if your driver was attempting to use a highway=service as a short-cut then the routing algorithm needs review. 
The last time I surveyed this area, there was not a visible barrier at the entrance. The Cresswell Road end has gates, but I've only seen them opened.
https://www.mapillary.com/app/?pKey=309098000663965
Happy Mapping,

James