Due to a balls up at the till in M&S this cost us precisely zero pence! Much darker colour that I'd expected, but then again, my experience of white Bordeaux is minimal. Not a million miles away from a maconaise offering, perhaps? Slightly more of a peach edge to the fruit (almost like languedoc whites?), could that be the semillion? It has 'a hint of oak' according to the label. Might this explain the richness? On the back of this (should have been £16 a bottle) I'd be tempted to go back to white Bordeaux and test the waters further.
