I finally found a field of poppies. Having searched for one for a long time (seems like you just need to happen upon one, no one knows where they exist) I was introduced to this one by my lovely boyfriend.
The poppies were quite sparse, but there were still thousands of them, and really tall too. The field was on the right hand side of the road if you’re joining the A46 towards Bath from the M4. Just a bit past the Marshfield bakery/dairy/ice cream place.