Sparce and yellow sounds like poor drainage. This is not the time of year to remedy. If you get a few dry days you could try lightly brushing the worm casts (if that's what the clods are) to disperse them.
I think you need to do the old fork and wiggle regime all over the lawn in March/April and brush in some sharp sand to improve drainage. Then sprinkle on some lawn feed and leave for about a month. Then re-sow any thin patches.


For the road: GSXR600K1
For the track: GSXR400GK76A
For everything else: Citroen Belingo[/quote]