A peace campaigner and grandmother was sent to prison for two weeks after failing to pay fines imposed for taking action at two spy bases.

Sylvia Boyes, of Wimborne Drive, Keighley, was fined a total of £700 in 2009, at court in Dumbarton, for entering the North Gates at Faslane, blockading Coulport – both nuclear bases near Glasgow – and painting on a rock in the road the words “Scots Say No to Trident” at Coulport.

The 67-year-old, who has served four prison sentences relating to action in opposition to nuclear weapons, was sentenced to 14 days on each charge to be served concurrently.

Her husband Robin Boyes said: “She spoke to me from New Hall prison in Wakefield and she seemed fine.

“She was pleasantly surprised that she wasn’t sentenced to at least a month.”

After her sentence, Mrs Boyes said: “As a responsible person I must act to bring about disarmament.

“A necessary part of that campaign is to carry out non-violent direct actions at military bases.

“No Government can continue policies without the active or silent acceptance of its people.”

Hannah Tweddell, of Yorkshire CND, said: “Sylvia’s action is an important part of the campaign against nuclear weapons.

“It is another way of challenging Trident through the legal system and we fully support her action.”

Boyes and her fellow campaigner Helen John, 72, of Keighley, were the first to be convicted under new anti-terror legislation on April 1, 2006, the day it came into force.

They were found guilty of trespassing on the US base at Menwith Hill and conditionally discharged.