Chris Isham has been awarded this years Dirac Medal of the Institute of Physics for his work on quantum gravity. For information about his many contributions to the field you can just look at the IOP page about the award.
In addition to the Dirac Medal the IOP has just announced a whole slew of other medals named after British Physicists. The Newton Medal this year goes to Leo Kadanoff who noticed the important role of scale invariance and universality in critical systems. The Faraday Medal is taken by Alan Watson for leadership of the Pierre Auger Observatory that studies ultra high energy cosmic rays. The Chadwick Medal is won by Terry Wyatt for work on Hadron Colliders. Another Imperial College prof being honoured is Arkady Tseytlin for string theory research who got the Rayleigh Medal.
There are a load more which you can read about here. Congratulations to them all.