I've got a post hole to excavate in this dig. This shows it carrying on down from the 40 cm level. It seems to be about 72 cms deep from the current ground surface. What I have removed seems to reveal just the hole created by the post. The hole to take the post was dug wider I think. Finds in the hole suggest a relatively recent date. Since this photo was taken and the hole has been widened I have found a piece of clear glass that looks fairly modern.
Removing the top surface of level 5 has revealed a change in soil type. I have come to a fairly poor soil, lacking in humus with a higher chalk content. At a guess I'd say that I am just going below the medieval cultivated surface. It is after this that things should get more interesting. We will see!