Raspberry canes

Hello all.
           I have at the moment an empty plot next to mine the council came and strimed it down to ground
           level there are dozens of raspberry plants shooting up . My question is if I dig some up when would
           be the right time to replant them ? as I have not got a space for them at the moment I intend to grow
           them in pots until I can get sorted. They are about a foot high at the moment.
                                                           

.Thanks newshoot for the reply . I assume the plot is still vacant because I was offered it.
 However I already have an extended plot so I do not think I could manage it , I am retired but this is my
 first year of growing crops and I spend a lot of time down there and have one of the tidyist plots on site
 I do not want it to become a burden, but thanks for your advise.