The graveyard at Yoxall, scene of the desecration

She was arrested at her home in the Burton-upon-Trent area on 1 December and answered her bail on Friday.

She was one of three held and later released after the desecration of the grave of Gladys Hammond at St Peter's Church in Yoxall, Staffs, in October.

Mrs Hammond, 82, was related to a man involved with a guinea pig farm.

She was the mother-in-law of Christopher Hall, who part-owns Darley Oaks Farm in Newchurch, Staffordshire, where guinea pigs are bred for medical research.

Gladys Hammond's body was dug up in October

The Hall family has been subjected to a long-running campaign of intimidation by extremists, including hate mail, malicious phone calls, hoax bombs and arson attacks.

Two men, aged 41 and 34, remain on police bail in relation to the inquiry after being arrested on 14 October.

The burial plot of Mrs Hammond, who was laid to rest seven years ago, was disturbed on 7 October.

Her remains have still not been recovered.