Help please,

moved two years ago and laid new turf in Spring 2005, no problems at all and
the lawn was in splendid shape this summer.
Last mown mid October. Now starting to die in patches.

photo of part of it
http://uk.pg.photos.yahoo.com/ph/bar...cd.jpg&.src=ph

Is this just from waterlogging, The piece in the picture was laid over an
old flower bed, ( well prepared for turf)

TIA

JT