Hi, Mel. How kind of you to care for these cats! I think the most important thing you can do for this little group is to contact an organization that will neuter them. There is a list of organizations by state at the top of this forum. If you're in the UK, there is also a source for information and help.
If the kitties aren't socialized, they can't be adopted, so you have two choices, one of which is to netuer them and very gradually tame them, which is possible.. with patience, time, and reward, and then turned in to a no kill shelter with the hopes of an adoption. A home is, of course, the ideal solution.
The other option is to have them neutered and returned to the wild. You will still be doing them a great favor. Please read the stickies, that is, the list of informative threads at the top of the forum. There is very good information in these articles which will help you with either option.
If you can socialize the cats, that would be ideal for them. Forgive me, but I think you rushed this a bit. First, they must trust you, and that is a very gradual process. They might never have been touched by a human being, and you would look quite large and frightening to them. Sit quietly and make no moves toward them. Put the food where they can see you, and speak very softly. Move the food a bit closer periodically, still sitting quietly. Treats, gentleness and food will help immensely. If you don't rush matters, they will learn to trust you. Talk gently and make every contact a pleasant one.
When the weather permits, can you limit them to one room, so they don't panic? If you can move them and the food indoors and sit quietly while they eat, moving the food closer and closer, bit by bit, and interactive toys, (eventually) they will learn that you are not going to grab them.
If they know the door is open and close, they will not be quite as nervous. Often, after neutering, toms will be more gentle and easier to work with.
Eventually, if they want to continue eating, they will approach the food, even when it's very close to you. Please don't make the first move towards contact. It is important that the feral cats make the first moves.
(although you are leading them to that point!
) It would be easier if you could put one of the kitties at a time in a quiet, small, dimly lighted room. However, they must lose a bit of their cautiousness with you first. If they continue to panic inside the house and have not come to you for contact, this will be much harder. However, it's not impossible, if they have learned that you can be trusted not to grab them. Obviously, if they are climbing the walls, they're not ready to stay indoors.
Try to build trust outdoors and in that one room with the door open, so they know they can go out whenever they want, and there is nothing in their way. When they want to be touched (their idea), they will let you know...by rubbing up against your hand. You must still touch them only gently, and never grab them. Hopefully, with time, they will welcome your gentle touch and the treats that they get. You want all contact with you to be pleasant.
When they get used to you and the house, you could try to tame one in its own quiet and dimly lighted room. Now, it's very important to sit quietly in that room several times a day, reading or listening to soft, calming music, and your gentle voice. Use the same techniques mentioned before, moving the food a bit closer periodically and having treats and interactive toys ready for them. Many people have tamed ferals this way. It takes time, but is very rewarding! If you decide to do this, our members can help you with advice.
So, first trap and neuter them, covering the trap so they don't associate you with this frightening experience. Skip a day's food so that they are very hungry, and camouflage the traps. Put food in the trap that has a strong, fishy odor. Stay nearby, so they can be taken to the shelter, humane society, or no-kill shelter (that you have found on the lists I mentioned before) as quickly as possible. Alley Cat Allies is a great resource for advice in all respects, and I'm sure our members who do this frequently will offer some great advice. If you borrow several traps, this would be ideal. There is financial help available and organizations who care about feral cats!
You are very kind to care for this little group. I hope you can prepare them for your move. Please remember to be patient and allow them to make all of the decisions about contact...with your encouragement. And please keep us informed.