The second paragraph ("money goes as follows") explains the notation. 'd' is for pence.

Translating prices into modern coins is a hard problem, because you're not comparing like with like. When two countries/markets trade, prices in one can be compared to the other. But across time, when the available products are drastically different, and when the very concept of money and of price was different from today, it's not clear what the comparison would even mean. For instance, the price for very many things (e.g. food, and the wages of many professions) was fixed by law and could stay constant for centuries.

If this had not been the case, there would be no meaning in compiling a price list that includes dates across 3-4 centuries, but only one price point for each item listed.