SOME 19TH CENTURY NEWSPAPERS SOURCES FOR GUYANA (BRITISH GUIANA)

Public Record Office,
Kew, Richmond Surrey TW9 4DU England
Tel: +44(0)181 876 3444.

Ref: Colonial Office 116
Description: Miscellanea
Date: Newspapers
1835-1836 The Guiana Chronicle
1837-1838 "
1839-1840 "
1838-1842 The Royal Gazette See Colonial Office 115/4-6
1843 "
1844 "
1845-1846 "
1847-1849 "
1849-1850 "
1851-1852 "

I have found the above provide an excellent source for BDMs.
Also it was the custom for people leaving British Guiana round that time to put a notice in the newspaper presumably to inform their creditors and friends.