Steps have been taken to stop ghouls doing their own search of a nature reserve where Levi Bellfield claims to have dumped the body of a missing student, sources say.
Access codes for the site have been changed after serial killer Bellfield confessed to murdering Elizabeth Chau in 1999 and burying her body there.
Thames Water, which owns the reserve, has stopped applications for new membership and has blocked existing members from taking non-members on the site.
