Dear Christine, thank you for your comments. I buy the cheap plastic propagation covers for seed trays when I am doing small or fine seeds. The covers are reusable for many years and keep the moisture in, which is important to me as the British weather can be very strange indeed. You can buy them in packs of 10 and I do not need anymore than that and they save me spraying water constantly and worrying about them. A big bonus is they are washable and you can store them away when finished with and they are fine, when stacked together they do not take up much space at all.
Kindest regards form England.
Neil.
p.s. In flower at the moment!