THE Yes activist behind a campaign to erect pro-independence billboards has revealed that a third image was rejected by an outdoor advertising agency.

David Hooks had previously explained on social media that two billboards, created by ItsTime.Scot, had been knocked back by advertising agency ClearChannel – with no “good explanation”.

Now he has confirmed that a third image has been rejected.

He tweeted: “Another image we wanted to use but were denied by Clear Channel’s legal team.

“Obviously a riff on ‘Labour isn’t working’ but as with the others they didn’t get back to us with a response in time for us to make changes. We still don’t know why this one wasn’t allowed.”

The posters were part of a series comprising of 18 in total, due to go live on Monday. But Hooks said the rejected billboards had the “strongest messages”.

The other designs which were knocked back included one showing a nuclear bomb with the heading “Westminster loves bombs”. Another depicted a London skyline with the caption “paid in Scotland”.

READ MORE: Ad agency bans pro-independence billboards from Scottish towns

A ClearChannel spokesperson said: “Clear Channel takes a neutral stance towards all advertising and has in past run campaigns from across the political spectrum. We’ve accepted a booking of 10 billboards for ItsTime.Scot, across 10 locations in Scotland.

“With all advertising of a political nature, we have additional internal procedures in place, as the UK Advertising Code does not provide clear cut guidelines about what is and isn’t acceptable.

“The majority of campaigns provided by the client were given the go-ahead. We politely declined a small number of campaigns that we felt may provoke a negative response within the communities in which operate.”