ERADICATING horsetail and bindweed

having prepared my allotment this year with much digging (it was badly overgrown and i've had to dig it by hand to remove the couch grass - which i'm pleased to say hasn't come back yet) i am still beingh troubled by horestail and bindweed. There are a number of concoctions that you can use to get rid off this but my question is when should i do it. Should i wait until the winter and continue removing it by hand or is it safe to spay it or traeat soil with something now . Is ther something that will kill both ?

updated profile - organic please

I have also inherited a overgrown lot which was covered in couch-grass, mares-tail and dock. I am slowly working my way down the plot digging and taking every weed out by hand. Its very time consuming but the bit I have done has stayed weed free, I know that they will return but because I have taken them all out then they will only return slowly.