A less than direct route

If you type 'from: euston station NW1 to: king's cross station', Google helpfully gives you the following route, four hundred and fifty miles in length by way of Birmingham, Preston, Carlisle and Glasgow, to a bus station in Lamlash on the Isle of Arran, a couple of miles up the coast from Kingscross.

OK, no route-finding error is going to compete with 'swim across the Atlantic Ocean', but this one is on a much less culpably stupid query. You have to put in 'NW1' otherwise it says 'Euston station is ambiguous', which is also fairly daft considering that it's absolutely certain about King's Cross.