The songs all draw heavily on the advice given in what is still one of England's most famous cookbooks, a commodious volume giving advice on everything from cookery to managing one's servants and budget for the aspiring middle classes of the 1850s and '60s. That, therefore, comprises the words and messages of the songs themselves: how many servants one can reasonably afford, given one's budget; why one should never chat about trivial subjects; cooking for charitable purposes; the importance of the lady of the house. It's all tongue-and-cheek and funny, while still being rather proper, the self-conscious modern composer appealing to his contemporaries while bringing to life a monument of Good Advice.
And so, my friends, lest you had any doubt: if you earn less than 500 pounds per year, you cannot afford to keep a full-time cook employed in your kitchen, let alone much other help other than part-time.