If you are concerned about flys cover them with netting but I have not found them a problem.
Rather than store them in oil, store them in the freezer where they keep wonderfully for a year and are a low calorie snack.
I discovered a very unexpected and superb use this year when I mixed the remains of last years bag with some of last years home made tomato passata. The result was a thick and so tasty tomato sauce which could have been diluted to be hot or cold tomato soup or used as it was for a rich tomato sauce or base for a bolognaise sauce.
Val says sounds wonderful Ginny.