Not sure what 'windings isolated' means... they look like transforers, black boxes with a US plug in on one side and a UK plug out on the other... my knowledge of things electrical is pretty bad.
As far as getting a Power Conditioner goes, would that solve the problem of having combined US and UK power supplies? I emailed Furman a bunch of times but I've yet to get a reply on whether any of their products would suit the bill...