Please help with this bird ID

Good afternoon. 

I am stumped by a photo of a bird that a colleague has sent on to me. It looks black and white from the pic and appeared larger than a blackbird or robin. It was seen in an urban area in Hertfordshire this week (24 July). It made a call like a car siren and was very loud for a smaller bird.  

I genuinely am not sure what it is? Could it possibly be an escaped cage or game bird? 

Please see photo below