Can I start by apologising if this is the 100,000 time the followin question has been asked but I am struggling to get a decent answe (from my in laws!)
We have a v.old lawn (60 years), and it is showing its age. Added t that the soil is very heavy clay, and the drainage is a nightmare.
We plan to dig a soakaway, and lay the special drainage 'pipes' t drain the worst areas. Once we have done this we plan to top the groun with topsoil and horicultural grit to help the drainage.
My question is - do I have to completely 'lift' the old lawn or can :
a) leave it as is and lay topsoil + grit over it
b) rotovate it and lay topsoil + grit over it.
Sorry to be a pain