Penny, the four hens should be fine with one male especially after some time when they all settle in during the season. If you look at some of the commercial flocks they often will have 6-10 females to each male. The only thing to watch for is sometimes a female will hide from the male in groups more than 2 and you may start off with some infertile eggs. If you have room it's nice to be able to put two hens in two separate pens and rotate the male every couple days. Of course the Best of all worlds is one hen per cage so you can pedigree your hatches, but most of us don't have that much space especially with LF. This will also lessen the damage the males might cause a pen of hens over the season. I have a couple pens where the hens are missing feathers now and it would be great to have an extra pens to keep the males alone for several days at a time now. I've found that the fertility will maintain after several weeks even if the males are missing several days at the time.
Hopefully some of the other members will join in here and tell you about their experiences too.
Good Luck with your season! drc