How many fruit trees does an orchard make?

Well as far as I am concerned the answer is 7 as that is how many I have just planted. This includes Bramley Apple, James Grieves Apple, Merryweather Damsons, Czar Plums and William Bon Chretien Pear. I have them spaced out 8m apart, staked and have started organising wire meshing around them to stop the pesky rabbits chewing the bark off them and my dogs deciding they are a stick to be chewed off and ran round with. Tomorrow I will finish off the rabbit proofing and mulch well round them to give them a good start in their new home. I was delighted to spot the willow rods I planted a couple of weeks ago for the orchard hedging and some wind protection have started sprouting. Now I just have to cross everything and hope they survive the unpredictable Caithness weather.