Well it looks like Ticketmaster are pulling their fingers out foe a change, i have tix for show number 3 & have just received this e-mail:
Dear Ticketmaster customer,
This is a courtesy email from Ticketmaster regarding your tickets for the now cancelled Michael Jackson event at The O2.
Our records show that you selected to receive your ticket(s) in lieu of a refund.
We are in the process of dispatching your tickets.
Tickets will be mailed by Royal Mail Special Delivery, which requires a signature upon delivery.
If Royal Mail attempt delivery at a time when you are not in, they will leave a card instructing you to collect from your local sorting office.
If you require any further assistance, please contact us by clicking on:
http://www.ticketmaster.co.uk/h/customer_serve.html
Thank you for booking with Ticketmaster.