Old Sarum, in Wiltshire, is one of the most famous examples of a “rotten borough”, where a constituency with a tiny (or, in this case, non-existent) population was still able to elect MPs.
The abandoned medieval village technically had 11 voters, but none of them actually lived there – its only real inhabitants were a few sheep. Nevertheless, Old Sarum had two seats in parliament from 1708 to 1832.
It was so valuable as a political opportunity that despite the land only being worth £700 in agricultural , it sold for £60,000, which is equivalent to tens of millions today.