In April this year we went to Turville (click here to see map).  The claim to fame (besides bluebells) is that the "Vicar of Dibley" is filmed here.

On the way to Turville, halfway between J4 and J5 of the M40, there is a stunning view (from the opening of "Vicar of Dibley") that looks over the valley.  These yellow fields are Rapeseed.  Unfortunate name for such a beautiful plant.  The fields are such a gorgeous yellow, but the weather didn't do the photo justice.