Using Plan, I'm getting a slightly dodgy coastline between Portsmouth and Lydd. It seems to be because the coast has been newly defined as straight lines joining widely separate points.

Using the latest version of Plan with the latest data.

I've looked at my tablet which has Plan 1.4.2.28897 and data which expired on the 23rd. This hasnt got a problem but I've just updated the data and it shows the same issue, so it appears it's a data problem rather than the program.