You might be thinking of the Robots of Death, RG.
I can see how you'd arrive at the conclusion that they look similar, but the robots there looked a little more humans in terms of their 'face' compared to this silvery robot, and were a bit more green IIRC. This robot has seemed to have bit of a purple light in its forehead?
Also, dinosaur in what appears to be London.
Yes I was.
Yes, also, wasn't one of them silvery?
Though I did see the purple light in the photo.