The body was found in a green sleeping bag on 18 December by a man walking his dog in Fen Meadow, Woodbridge, Suffolk.

The BBC's Peter Laverock: The arrested man's house is being examined

Police said at the time that the body had been kept in a dry, airy place for many years.

It is believed to be that of 25-year-old Steven Burt, who has been missing for several years. But police have given no details of his relationship with the man being questioned.

Forensic tests

The man was arrested in Woodbridge town centre on Wednesday morning and has been taken to Ipswich police station for questioning.

His empty house in Woodbridge, has been sealed off for a forensic examination.

The exact cause of death is not known because of the state of the body.

Detective Superintendent Dave Corderoy said: "Scientific tests are still being carried out to establish the identity of the man.

"However, from information we have, including height, the sleeping bag and tags, we now believe this man to be Mr Burt."