Possible Clues:

• Moving up to A1 in perfect state
• Perfect place for turning one vessel covered in gold
• Golden state?
• An ideal answer, having worked out circumference-diameter ratio ...
• University on Jersey, say, has one area that's heaven
• Ideal or perfect place
• State you'll never get to
• Ideal society finest one featured in posh article
• University best, excellent, rising — an ideal place
• Thomas More's 1516 book about life on an imaginary island