Is She Worth It?

Chris and I are contemplating trekking back to the UK in January for Kylie's Showgirl tour. We had tickets two years ago to see her in Dublin, but cancelled due to work obligations. Now that she's returning to the UK in celebration of her triumph over cancer, tickets are available via Craigslist and Ebay. But are they worth over $300 per show? Besides that, will British passport control even let me pass?