If queues at Immigration are the only failings at Heathrow I imagine they'll have surpassed the expectations of anyone who travels frequently and has seen how things can be done!
Mr Whittingdale continued: "While visiting tourists will understand that the Olympics is a busy time, if the wait (at immigration) is in excess of an hour it may deter tourists from returning.
FWIW, I would call an hour's wait little short of disgraceful! Doesn't any of the Air Passenger Duty find its way into funding government-required services like.....Immigration?