Power query, replace multiple column values dependent on other column values

I know this is answering own question but I've come up with a a better way,

Liist.Accumulate( Source [Name], Start, (S,C)=>  Table.AddColumn( S, C, (A)=> Text.Contains( Source { [Name = C ] }[Item] ,  A[Item] ) ))

which might make more sence seen working, attached.

Richard.