possible Harvest Mouse nest

possible Harvest Mouse nest

Observation - possible Harvest Mouse nest - UK and Ireland. Description: I found this nest (one of two) in Brambles on a river bank in Berkshire. It looks to me like Harvest mouse, but in Brambles has me questioning it. Could it be anything else? There were two about a yard apart, and I couldn't find any others despite search

I found this nest (one of two) in Brambles on a river bank in Berkshire. It looks to me like Harvest mouse, but in Brambles has me questioning it. Could it be anything else?
There were two about a yard apart, and I couldn't find any others despite searching