The BAA Annual Report includes:
In July 2011, the South East Airports Taskforce, sponsored by the Department for Transport, recommended that consideration be given to Heathrow having greater operational freedom to prevent or mitigate disruption. For example, this might involve simultaneous use of both runways for arrivals and departures in such circumstances, within the existing overall cap on aircraft movements. An initial trial of runway use in this manner concludes in February 2012 with another trial expected during summer 2012. If implemented permanently, such measures should improve areas such as punctuality and baggage misconnects as well as bringing environmental benefits such as reduced stacking.
It's the first time I've seen mention of "baggage misconnects" as being something that is potentially affected by the trial. And as it is directly related to the "passenger experience" I'm surprised they haven't included a metric for it in the protocol.