Thanks for the prompt reply Mike, I can understand what you are saying
but I couldn't keep to anything like twice a week for mowing. Thats one
of the problems I have, by the time I see the weeds they have spread
from the edge of the grass into my boarders.
I'm thinking if I get the black stuff down, turf it and get a year
without these buggers I can then assess it. I can always peel the turf
up and take the black stuff away then re-lay the turf in a few hours.
Just don't want the truf to die on me :-)