Last year I tried something a bit different (I always like to try out something new)
What I did was I did not take autumn runners,I did not cut my plants back at the end of the season, insteadf I let them die back naturally.
In spring I spread some FB&B fertilser on the bed, forked it in with a hand fork.
As I progressed I lifted the self set rooted runners and replanted them and planted them in the first two rows of my bed.
1) to see how they performed.
2) To keep my new plants away from my older ones.
3) I filled any gaps.,
This seemed to work quite well and I found the new ones cropped as well as the older one, so this year I am going to do the same so that I can compare 1st & 2nd year plants along side older plants.
OK it is suggests that I am being a bit of an idler, and at my age perhaps so, but if it works then this can only be a good thing when I get older still!