I may as well confess now I have no experience of Sykes's at all and limited experience of Booted so I've no intention of making any comment over the ID.
The warbler showed well to scope views intermittently for about an hour, briefly feeding on a rose for 30-40 seconds and occasionally popping out of various bushes. Booted would be a fourth county record I think and Sykes's a first for the county. All I will say is that it looks quite warm toned in the image below but that wasn't the impression I had in the field and I think that the warmth is more a consequence of the mid-evening light and incorrect camera settings.
I should really save this picture for a mystery bird competition as it has uniquely managed to not capture any of the features such as bill, primary projection etc that may have been useful. In fact it is quite possibly the worst photograph of a rare bird ever, there should be a competition for shots of this quality.
Sort that one out if you dare......
Rather better images including the whole bird can be found at the NTBC Sightings Page