Goldcrests and Sparrowhawks

My parents live near Richmond Park and Wimbledon Common so have a great spot for garden birds. Despite that fact it is always surprising to me how different the birds can be. For instance, in my garden in Kilburn I have starlings on the table all the time which my parents rarely have and I also get goldfinches which are also rare for them. However, they are just starting to get ring-necked parakeets and for years now have been getting manadarin ducks coming every spring and staying until mid-summer. I was there recently with my binoculars looking out for the parakeets and also hoping for my first goldcrest of the year as they get one coming to their water fall in the back of the garden. Just as I was standing there, bins in hand, a sparrowhawk flew into the garden to harry the blue tits. They had told me of this happening before but I hadn't quite believed it, as something you want to disbelieve through pure jealousy. However, there it was in full view, my first one for the list.