Do you think it is this: Creeping Cinquefoil (Potentilla reptans)
Another perennial creeping plant, looking very similar, both in leaf and flower, to a buttercup, but belonging to a different family, Rosaceae, and therefore also similar to a strawberry. Differs from a buttercup in having separate toothed leaflets rather than a divided leaf, and the flowers are not shiny. Creeps by stolons, rooting at the nodes, as strawberry runners.
C r a f t y P e o p l e ---- confessions of a lapsed reader 
Monday, May 11, 2009 at 18:54
Hello, thanks for your comment on my blog! And although it is quite hard to tell I would be careful in case it is Wood Avens which seeds itself like mad and is a menace in my garden! If it develops little tiny seed heads with mad fronds then it IS!