Since I'd heard most reports from a minor road running along the railway west from Osuna, this was where I headed. Taking exit 80 just west of Osuna (see map), I turned north as I came to the end of the slip road onto the minor road which runs along the side of a s mall venta (near a Repsol petrol station). This is a poorly marked junction so if uncertain just make sure you head round the eastern side of a newly laid out small industrial estate. At first you drive through olive groves. The road follows the Seville-Granada railway line, but after a few kilometres the new fast AVE line comes sweeping in from the south. This new fast line then runs paralell to the older track towards Seville, but unlike for the original, dusty level crossings are considered unsafe. Conveniently, a series of ramps and bridges, each offering panoramic views across the area, have now been built to cross this line. (Hopefully, as the bustards have grown accustomed to the old line this new fast service, open in 2012 shouldn't disturb them too much). Although bustards can be seen along both the A 407 and A351 (north of Osuna) looking here is by far the better option. The quietness of this road allows you to pull over where you please and these new viewpoints greatly improve your chances of spotting distant birds.
A similar distance further on you come to a crossroads – to the left are some ruined fincas (c) and to the right a track (d) that heads off towards the A 407. The fincas have Lesser Kestrel and I've seen Montagu's here. The track splits in two after the buildings and both routes look good for bustards (though so far I've drawn a blank here). The track on the other side of the road crosses good bustard habitat. I have seen Little Bustard here plus Roller, Black-winged Kite and Stone Curlew. Naturally the whole area hosts a good range of raptors (Short-toed and Booted Eagle, etc.) and, during migration periods, stray Honey Buzzards may pass over. Check buzzards for Long-legged Buzzard which have occurred not so far away.
Back on the 'main' road, a small (but metalled) road turns off to the right neasr a sign for the 'Venta la Romera' (no longer, it seems, in business). This road again heads through excellent bustard habitat and makes a great short cut if you're heading over towards La Lantjuela. At times a temporary pools is established on the right before you reach the railway bridge – check it for Collared Pratincole, Gull-billed Tern and Black-winged Stilt. As well a Roller, this is a good route for Southern Grey Shrike, Bee-eater and, near some ruins, Spanish Sparrow. The fields beyond the A 407 are worth checking for the same birds.
Back on the original road you soon pass though rolling cereal fields before you drop down into a hollow (f) - 'Laguna' de los Ojuelos. This area of temporary pools is the only place I've seen Black-bellied Sandgrouse in Andalucia, but I suspect I've used up both my luck and yours as I saw it from the train! (Amazingly, it flew up and flew along next to my window – not bad as it was a lifer at the time). There are fewer than 50 pairs in eastern Andalucia so I was incredibly lucky. This area, though, is good for Collared Pratincoles, wheatears, Red-rumped Swallow, Bee-eater and Roller so always worth a look. After a wet spring, large areas are flooded here attracting White Stork, Flamingo, stilts and many waders. Unfortunately, the best areas are beyond the railway line in a strictly private finca – even the most resolute twitcher might be put off trespassing here as it's a farm raising fighting bulls! A more permanent lake can be glimposed through the olive groves from the SE 720, but again this is strictly private. A track running west from the junction with the SE 720 may be worth exploring - the only time I tried to do so it was badly rutted and very wet..