Help Identify this Bird

I am no bird expert.
This bird has arrived in our garden and taken up semi residence.
It is a little bigger than a blackbird and is quite agressive towards any other birds, actively chasing them off all the time but I have no idea what it is.

Anyone?

Starling ?

Doesn't look much like a starling to me (here's a starling: https://www.pentaxuser.com/photo/user-6093/starling-5978).
It could be a young blackbird, but you said it was bigger (or maybe a big young one ).
Steve, use this nice tool to find out:
http://www.rspb.org.uk/wildlife/birdidentifier/

I'm not a bird expert either but I reckon it could be a fieldfare or maybe a redwing...:

Mat

Thanks
techno I see you are about as knowledgeable on birds as I am

I have been here
and now Im pretty sure its a fieldfare.

I was going on it's breast and in my defence I did use a question mark

I think it's a fieldfare.

What about a Mistle Thrush link

Looks like a juvenile Song Thrush to me, blackbirds dont have the the light coloured underbelly.

It must be a fiesty little bugger if its chasing adult blackbirds away though, in my garden its the other way around, our Blackbirds have scared off the one Thrush that used to visit which is a shame as they really live up to their name of Song Thrush

Fieldfare.

Waggot right, you normally see them in flocks, they come here for winter.
In bird books they tend to look blue on there backs, but depends on the light, hope this helps!

Thanks all a fieldfare it is then
Interestingly the blackbirds have started to outwit it, there are only ever 2 blackbirds in the garden at any one time. Today however there are 4 and they are spread out and running the fieldfare ragged, they are becoming less timid of it and i am sure they are taunting it. One gets its attention whilst the others feed. Great to watch.

Heres another picture with a bit of sun on it this time.

Definately a Filedfare, the second pic is much better and shows more of the birds colouration.