Help with an ailing laburnum

adamadamant

My friend has been asking me for some advice.  She has a laburnum which is ailing dreadfully, after a good spring.  Photos attached.  There doesn't seem to be any sign of pests, or fungus, and if she snaps a twig is it still green inside.  I suspect it is suffering as a result of last year's drought, but I would welcome any other thoughts.  Also I dont know what to advise her to do if it is in severe stress. Can anyone help? 

adamadamant

Also, although I havn't seen the shrub myself it does occur to me from the photos that it is between a rock and a hard place, ie the house and the wall, and is probably pretty stressed for water at the best of times?