Dunnock vs. house sparrow?

Oops, nearly forgot this is the Big Garden Birdwatch weekend - you've still got time all tomorrow (Sunday 31st), when with 'Sleet and a gentle breeze' forecast, what better to do than sit at a window and count birds? 

I guess most of us might recognise robins not least from our Xmas cards, but dunnock vs house sparrow?  You can see dunnocks (left) are really very pretty, being quite slatey grey with subtler markings generally, while the house sparrow (right) is more in your face.  (Click on the photos to enlarge and see the captions)

​Just go to the RSPB website here for all you need to know - but you only need to spend an hour.  (Personally, I spend my hour and see hardly anything but as soon as my time's up they all arrive so I restart the timer.  It's an art, not missing lunch.)

By way of a challenge, here's a link to what Izzy Fry of our Young Nature Watch thinks we might see.