Preheat the oven 200˚C/Fan 180 ˚C/Gas 6.
Put the oats in a bowl, then stir in the prunes, parsley, ground cinnamon, orange juice and zest and a good splash of oil. Crush the juniper berries with a pestle and mortar, then add to the bowl. Season with salt and pepper and mix well.
To prepare the partridges, use a small knife to cut down either side of the birds wishbone and remove it. Now use your fingers to check that all the heart and stomach have been removed from the carcass. Repeat with the remaining birds. Divide the oat mixture among the partridge cavities. Cover the back of each bird with a bacon rasher and tie in place with kitchen string, then truss the legs together for even cooking. Season all over with salt and pepper.
Heat a heavy-based roasting tray, or 2 smaller trays, over a medium-high heat, then add a good splash of oil. When it is hot, add the partridges and turn them as necessary until they are coloured all over and the bacon is crispy. Transfer the roasting tray to the oven and roast for 12 minutes, adding any extra oat balls for the final 6 minutes.
Meanwhile, skewer the fig halves with the cinnamon stick pieces, as if making a kebab. Add the figs to the roasting tray and return it to the oven for a further 2-3 minutes until the partridges are medium rare and the figs are tender. Transfer the birds to a warm plate and set aside to rest for 5 minutes covered with kitchen foil.
While the birds are resting, return the oat balls and figs to the oven.
Serve the partridges straight from the roasting tray, sprinkles with rosemary, with the figs and the oat balls too.