There were rumours of interesting things going on at Heathrow at
Saturday.

? One plane having just landed slipped as it was turning off the
runway and the pilot of the following plane coming into land saw this
and decided to "go around".

? An Airbus coming in to land in the snowstorm suffered ?blocked pitot
tubes and caused "unstable airspeed indication" alarms which triggered
the decision to go up again.

Probably all routine stuff - but it might make people running things
twitchy.......