Exotic Delight or Foreign Pest?

I'm not sure what I did to ruin my April Blipstreak. Wife was busy so I had to help etc.

After the people did our garden, the sparrows didn't return, perhaps because there were no overgrown roses to hide in. But the Robin has been around the whole winter and a couple of blue tits. 
I was horrified to see the parakeet, they are too invasive.