Sorry Tweet, but you're better off digging out the weeds - if you're quick and can prepare the area within the next week or so, October is the best month for laying turf. Dig it over, removing all weeds and large debris as you go, level off, walk all over the area on your heels to compress the soil, re level, rake up the top to a fine tilth, lay turf. Or sow seed - seed is cheaper, but can't be walked on properly for 3 months, and the first cut should be done with shears (although a hover mower seems fine, that's what I use). Any other mower will rip the seeds out of the ground... and seed should really go down as soon as possible.