Many thanks for the useful link, Ian was really pleased.
We were in the Netherlands as a family last August and borrowed the white bicycles in the Hoge Veluwe National Park which was fun but I'm not going on this year's trip as Ian and his friends take their cycling rather too seriously. I've been on walks with them and stopped to admire a flower or watch a dipper in the river only to look up and find everyone else half a mile ahead, so I'm sure that whilst they may admire the fields of bulbs as they speed by, there will be no stops for detailed looks at the flowers!