Q.Bluebells
I want to plant bluebell and daffodil bulbs in our woodland and would like to know which is the best naturalizing variety.

Nearly all varieties of daffodil and bluebells are good naturalizers and will happily multiply throughout the area. It is simply mor of a personal choice as to what you like. For more information on growing these plants, the following articles should help: https://www.gardeningknowhow.com/ornamental/flowers/bluebell/grow-wood-hyacinth-bluebells.htm
https://www.gardeningknowhow.com/ornamental/bulbs/daffodil/daffodil-planting-care-tips-how-to-plant-daffodils-in-your-garden.htm