Solved Can anyone identify this?

This is one of the many plants in my garden I can't currently identify. A friend said Valerian, but we have lots of Valerian growing wild round here and it doesn't look like it, especially the flower structure. It's perennial, non spreading/invasive and is planted with ornamental grasses and herbs.

 

Giant white clover.

 

Thank you Palustris, it isn't giant white clover but you put me on the right track. I'll know for sure once it has properly flowered, but it is either trifolium trichocephalum or trifolium ochroleucum. Yay!