Thursday, September 24, 1998 Published at 15:45 GMT 16:45 UK
Britain 'sitting on a time-bomb'
Diggers and pile-drivers could set off fuse of one of the ageing bombs
Many wartime bombs are more dangerous now than ever, say ordnance experts.
At least 600 have been deliberately abandoned by the Home Office, some of which are close to new housing or industrial estates.
The oxidation of picric acid, which was used in the German fuses, has made them vulnerable to vibrations.
The construction union Ucatt is worried about the dangers to its members from bombs under potential building sites.
Thousands of British and American bombs were dropped on Germany during the war.
Three people were killed and 20 injured when a 55-year-old device exploded in Berlin earlier this year.
Two wartime devices explode in Hamburg every year and the law insists developers screen building sites for bombs before starting any ground work.
One of the bombs is believed to be buried close to a housing estate in Hull, which was targeted because of its port facilities.
Alan Johnson, Labour MP for Hull West and Hessle, says: "No MP wants a bomb under their constituency and I'm particularly concerned for the safety of my constituents.
"I think this does require some investigation and reappraisal by the Home Office."
A Home Office spokesman warned that the document in question was only an "inaccurate register of bombs dropped during the war".
He said the Home Office was currently working on how to put the information in the public domain and he said it may use the Internet to disseminate it.
The Luftwaffe's hidden legacy in Britain is the subject of a special programme on Thursday at 1930 BST.
The Lost Enemy, part of BBC Two's Close Up North series, can be seen by viewers in Yorkshire, Humberside and Lincolnshire.