Posted: 12/09/2013 at 22:00
Hi goldfinch, wrens are much smaller than house sparrows which are about the same size as bullfinches, but less colourful. The male is a bit more striking, but still mainly brown. You can tell a wren by its short sticking-up tail. This is quite a nice site for identifying common British birds:
The house sparrow used to be extremely common but has been in decline for the last few decades and has gone completely from some areas.