| COCALEAF | Cocaine source, used in Coke in the 19th century (8) |
| KOLA | Nut used in Coke production |
| COCA | Cocaine source |
| BUNSENBURNER | Heat source used in experiments (6,6) |
| STEAM | Power source used in a 37-Across plant |
| BIBLIOGRAPHY | A list of sources used in the preparation of a book, thesis, etc (12) |
| POPROCKS | Candy mixed with Coke in a chemistry experiment |
| HOLKHAM | - Hall; seat of the Earls of Leicester in Norfolk, originally designed by William Kent for Thomas Coke in the 1700s (7) |
| SOCKET | It may take a plug of coke in the street (6) |
| NICKEL | Cost of a bottle of Coke in the US for 73 years (6) |
| BROUGHAM | Closed horse-drawn carriage with four wheels and a raised open driver's seat in front, used in the 19th century (8) |
| MENTMORE | Village in Buckinghamshire, home to a vast Grade I listed house designed by Joseph Paxton for the Rothschilds in the 19th century (8) |
| EDMONTON | Founded in 1795 as a fort and becoming a major fur-trading post in the 19th century, what is the capital of Alberta? (8) |
| BAMBURGH | Norman castle in Northumberland restored in the 19th century (8) |
| PLYMOUTH | Rock: breed of chicken developed in Massachusetts in the 19th Century (8) |
| BAROUCHE | A four-wheeled, horse-drawn carriage popular in the 19th Century (8) |
| LUDDITES | Aggrieved textile workers who had a smashing time in the 19th century! (8) |
| SANDWICH | Originally perceived as a food men shared while gaming and drinking at night, this meal began appearing in polite society in the 19th Century |
| OPIUMWAR | One of the two conflicts between China and Britain in the 19th Century (5,3) |
| TAMWORTH | Breed of red-coated pig brought to England from Ireland early in the 19th century (8) |
