Hi stone, I just remembered, what was the final straw before I began my preparation to improve this patch of lawn.
My neighbour downstairs, I'm four in a block, was getting a new heating system fitted, and the idiots fitting it dumped the old boiler, radiators on that patch of grass, I went mental the grass had turned white within hours they totally killed it, they said they thought that area was my neighbour's what a response, oh we never meant to ruin your lawn, we thought it was your neighbour's lawn we were ruining sorry.
Anyway after my rant, do you think the soil could still be acidic? or would it have washed away by now, I also riddled all the soil but I used the same soil, it was the summer of last year.