It does look in nice condition. Not the original headset though unfortunately.
Price is subjective of course. You could hold out for another in as good condition, in your size and for a couple of hundred pounds cheaper, though I seriously doubt that will happen. The frame is one of the best steel frames made and harder to come by these days, especially in good condition. If one came up in my size, and had the headset, though not entirely a deal breaker, and after trying to negotiate the price down a bit, I would still find it hard to walk away from for £500. You could always get them to remove the headset and RF bb for a cheaper deal, though make sure you get the seatpost clamp, probably harder to find than the frame
What do you think about this? Around 1550 €. And a lot of pieces hard to find here. Is this also a good deal ( considering it is complete)?