Dahlia tubers (Lower Earley RG6)

We have four dahlia tubers surplus to requirements if anybody would like any/all of them. They will need potting up and growing on before they can be planted into the open ground. I am afraid I do not know which variety of dahlia they are but when they grown they are VERY vigorous, the photograph shows the dahlia "hedge" on our allotment which is just three tubers. Please let me know when you could collect and how many tubers you would like