Look carefully across the Clyde towards the BAE shipyard at Govan and, among the cranes, you'll spot a shipping container with a giant "No" painted in white letters.

The shipyard provided the backdrop to Labour's main campaign event today and the giant No explained why.

John Reid, the former defence secretary, was at the Glasgow Harbour development in Partick to warn of shipbuilding job losses at BAE Systems, on the other side of the river, if Scotland leaves the UK.

He arrived at a chilly riverside walkway with Johann Lamont, Margaret Curran and a clutch of Labour MPs and trade unionists in Anas Sarwar's battle bus before sauntering up to a group of placard-bearing activists.

The UK, he told them, would not commission complex warships from a foreign country.

Alex Salmond, he added, should keep his promise to meet the shipyard workers, "look them in the eye" and explain how he would save their jobs.

"What would you say to a used car salesmen who would not look you in the eye when selling you a car?" he asked. "You'd say thanks but no thanks."

The activists heard from Ms Lamont and Paul Sweeney, 25, a graduate engineer who said his future in Glasgow would be uncertain if Scots vote Yes on Thursday.

The words told a story we've heard many times before during the referendum campaign and one the Nationalists have dismissed as "scaremongering".

That mattered not. This was all about reinforcing the message in the final 72 hours of the campaign. And ensuring that when the pictures were taken, that No sign was in background.