The theft of the bronze bust took place sometime between 9.15pm on Tuesday, July 15, and 8am on Wednesday, July 16.

Local history society historian Gordon Smith said: "I'm absolutely gob smacked that it's been nicked.

"You can get a good price for bronze these days but that's still no reason."

Lord Ridley was one of two merchants from Newcastle who bought up huge swathes of land in south east Northumberland.

"Lord Ridley founded modern Blyth, without him there wouldn't have been a Blyth," Mr Smith said.

"The harbour wouldn't have been the success it was without him."

The bust was completed in 1909 by George Skee, a protege of Lord Ridley, who was a talented sculptor.

Leader of Blyth Valley Council, Coun Dave Stephens, said Lord Ridley's bust was an important part of Blyth's heritage and described the theft as "disgraceful".

"I think it is a disgrace that someone has seen fit to steal and obviously attempt to make what must only be a few pounds from a monument which has survived two World Wars," Coun Stephens said.

"We have worked hard across Blyth Valley to make things happen and we can do without this kind of mindless and disgraceful theft.

"We are trying to improve facilities for young and old alike, and the people like the ones who carried out this crime will not deter us from continuing the good work we have done."

Police are appealing for information about the theft.

They believe that due to the weight of the bust it could not have been stolen single-handedly and a vehicle could have been used.

Blyth Neighbourhood Inspector Bill Fawcett said: "This was the theft of a distinctive statue which was well known in the Blyth community.

"It is likely whoever stole this may have told someone about it.

"We would urge anyone who knows anything about the theft to get in touch."

Anyone with information is asked to contact Blyth CID on 03456 043043 ext 61945.