On the web UI, dragging a pin to the UK immediately breaks/cancels any existing route and breaks the site until you reload the page. I had a nice route from Copenhagen->Stockholm->Helsinki->Tallinn->....->Paris and tried to drag it to London and *poof*, error message about not being able to route into the sea, and route gone. Can't even drag it back without reloading the page.
Comments
This should be fixed now – it now won’t let you drag a route out of the “region” where it started (UK/Ireland, mainland Europe, AU/NZ, North America). Thanks for spotting.