The 49-year-old pleaded not guilty to having an explosive substance under suspicious circumstances and possessing a prohibited weapon.
A fourth charge of possession of ammunition with intent to endanger life was withdrawn by the Crown Prosecution Service during the same hearing.
Lucas is due to stand trial for the two allegations he denies on July 26 at the Crown Court.
The charges relate to April 23 last year.
The charge of possession of explosives under suspicious circumstances can only be brought by police with the authorisation of the Attorney General.
Lucas is currently on conditional bail. He is required to live and sleep each night at his address in South Road, Lakenheath, or at a caravan at Hockwold, Norfolk.
Lucas must also not make contact with William Hudson or Robert Chipperfield and not take any steps to leave the country.
His passport remains with police.
eadt
