You may get a share of the reward if you’re:
the finder, and had permission to be on the land and acted in good faith
a person or organisation with freehold on the land
someone who occupies the land as a tenant of the owner
If you act in bad faith (for example by trespassing or trying to hide the find) you may get a reduced share of the reward, or none at all.
Archeologists and volunteers participating in an archeological excavation or investigation are not eligible for a share in a reward.