The Arnish Lighthouse is pleased to note that it has won critical acclaim in the most recent posting on The (Made Up) History of Stornoway journal. In a run-down of SY rhyming slang, the Arnish Light is equated to a Load of Sh*te, so talking Arnish is talking a - you know what I'm saying.
Conversely, saying someone is an Arnish Welder actually means that he is a Church Elder. Well, that would make a bonny one. An Arnish Welder talking Arnish. Right.