@Hangman, actually you don't want to get rid of the spiders. They are very beneficial to your garden actually, eating all the other insects that normally do damage to your garden.
I had a number of spiders in my garden when I had the bird netting over it. About a week ago I've taken the net off and I haven't seen nearly as many now. I'm thinking about putting it back on just to see if they will come back.
I did put the bird net up about a week ago and I'm happy to say I've seen a few more spiders hanging around the garden than there was without the net. They seem to like the netting.