I'm pretty sure Argleton was introduced by Tele Atlas importing badly OCRd gazetteers - as well as Aughton ≈ Argleton there was Downholland ≈ Downhollnad and Mawdesley ≈ Mawdesky which both get reverted in late 2011: https://twitter.com/MikeNolan/status/145076409344339969 I got a UK message saying not recognised - I assume it depends on the provider you're phoning from.