Sparrows Return

After 8 years without a sighting, we now have a flock of approx.10 sparrows regularly visiting our garden. I can't be sure whether they're Hedge or Tree but they're very partial to dried mealworms. We have had a problem with Magpies in the past and they were responsible for the loss of the sparrows. We also now have 2 pairs of Blackbirds, numerous Goldfinches, 2 male Robins and 2 squirrels which are regular visitors. I should add that it's a large communal garden in a sheltered housing complex so it's quiet with no children and no resident cats.