Hollow tine aeration is, in our opinion, the best thing you can do to a lawn especially when the soil is compact or clay based which is very common in the Nottingham area.  The treatment is mechanically done by a professional machine which basically removes thousands of cores from the lawn and leaves them on the surface to break down.  This acts as a twin-pronged treatment as firstly it relieves the compaction of the lawn allowing water and nutrients to get directly to the root zone of the grass via the plug holes left behind.  Secondly, the tines on the surface are packed with nutrients and good quality top soil and these will eventually break down and almost give the lawn another fertiliser treatment for free.  Some customers prefer the tines to be removed from a cosmetic point of view and we are quite happy to do this if required.