There's supposed to be an average of eight large hoards found per year in Britain but small ones are a weekly event so often don't get much publicity outside the find area.
There's more to be found than have already been located because if you read the reports of 99% of hoard finds the detector user has found one or two coins that the plough has brought up from the main cache then checked, perhaps taken off a foot or two of soil and finally the bulk is within detection range.
Hoards where there's little or no ploughing tend to be ignored as people have been told "if its large its rubbish".
Brian