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I am not at all sure but are the sepals too large for the Bulbous Buttercup, and are there hairs on the stems?
Could this be the Hairy Buttercup?
Hairy buttercup is a species I am not familiar with as there are no records from Ireland (where I am from) or the Isle of Man (where I now live and where the pic was taken). It does appear surprising that it is not present in the IOM as the UK distribution is on the west coast. http://data.nbn.org.uk/gridMap/gridMap.jsp?allDs=1&srchSpKey=NBNSYS00000...
Based on lack of historical records I will stick with my observation, but I will look more closely in future.
New Flora of the Isle of Man
Lat/Lng: 54.0, -4.8
OS grid ref: SC1766