Sorry, a very late reply to the question, I missed that post. And my situation is quite similar to ChrisTken in the following post.
My garden is on the coast, there is a lot of natural scrub outside the boundaries. I have feeders which the sparrows visit regularly. But I must emphasise that 5 years ago there were absolutely none. They expanded from a population centre in the nearby town of Bray at a rate of about 100m a year (I could track them on my local patch), starting about 25 years ago when the population all over the country took a catastrophic crash. Juveniles were the first to arrive, they would expand beyond the range of their parents in the late Summer and Autumn, then would be absent during the winter. Finally some started staying the year and now they are the commonest bird in my garden. About 5 years ago, possibly coincidentally, two male Sparrowhawk became regular visitors to the area and have remained since.
I can't help feeling that the widely differing experiences that people seem to have is to do with the fact that sparrows are very slowly re-expanding after a previous crash - in other words they're either in your area or they are not.
Cheers for that,
out of interest do the sparrows demonstrate shy behavior, do they come out in the open much or stick to cover, what are their food preferences particularely which seed and do you know where they are nesting.