To the South of the village is the Royal Hospital School, which has been in this area since 1933. If you've come to Holbrook via my "Welcome to Stutton!" cache, you'll have driven right past the school itself. In fact, if you stand by the traditional Holbrook village sign with the church to your left and the fire station to your right and look at the horizon, you can see the clock tower of the school above the trees at about 1 o'clock to your position.
You are looking for a small bison placed near to the traditional Holbrook village sign.
Please be aware that this cache location can be quite overlooked due to homes and the fire station across the road.