The old marmalade factory…

Keiller’s of Dundee had been making and selling jam in their confectionery shop since the 1760s. In 1797 Janet Keiller added thin strips of rind to an established Scottish recipe for marmalade and changed the consistency of the preserve slightly and it began to be spread on toast. But it wasn’t until the 1840s that the manufacture of marmalade became the principal part of the business.
In 1859 the company set up a factory in Guernsey because there was no sugar tax over here.
Read about it here if you would like to know more.