Relics of the past

What secrets does our house keep?
Credit: William Lam

Archaeologists recently found a fragment of Roman pottery in my home town, in the car park near our local Waitrose supermarket. My first thought was that the discovery would make a nice premise for a Latin text book: 

Metella and her slave Grumio visit the fish counter at Waitrose. Ever mindful of landfill, Metella brings her clay cooking pot to carry the fresh salmon home, but on the way back to their villa, naughty Grumio drops his mistress' pot and it shatters on the ground... Heu!