There is the Rutland site to, once you discover Ospreys you are hooked. Come migration time (Sept ish) it's amazing what can pass over your house on a warm autumn afternoon if you have the time to sit and look up "eyes to the skies" or go to a suitable open space, we have had "kettles" of 18 Buzzard go through together, Montagu's and Hen Harrier, Rough legged Buzzard, Goshawk, Marsh Harrier, Red Kites, Hobby, Peregrine, but no Osprey as yet in spite of a fishery down the road and a lake in the garden, perhaps this autumn. Warm spring afternoons you can try seeing them arrive to. Our biggest haul one afternoon was a total of 34 Buzzards heading south in 2 hours.
Friday evening we had roughly 16,000 swifts heading south in an hour