Dear Claire
Your new posted pictures can't be identified to species I'm afraid. Your sap (Sac) spider is a juvenile Clubiona. There are many species, all pretty similar and adults under a microscope are needed for all but one or two species. Your Unknown spider 1 is again a baby, after lightening the image it looks as though it might possibly be the jumping spider Pseuduophrys lanigera, but by no means a definite id. The Unknown spider 2 is a juvenile Pardosa wolf spider. Again identification of almost all of these requires adults under a microscope.