Usually presents as shingles second time round apparently.
It is my understanding that does not happen per se. Shingles presents at times of stress and is a recurrence of the original virus that remains present in your system, not because you have been exposed to the chickenpox virus a second time. Of course, if your body is stressed when fighting the virus, it could happen.
Also, shingles is not contagious unless there is direct contact with the blistered skin, and then the person exposed to the virus gets chicken pox, not shingles!
Singles is not nice – I hope you don't get it. I can still feel the patch when I get cold after a VERY mild dose some 9 years ago.