Posted: Yesterday at 20:33
For me it's a no-brainer......I would turn it over trenching in the grass upside down. Rotovating makes a mess and simply spreads everything in top few inches.
Ideally you would wait until September but if you're like me you may want to do it now. Turn it over, walk all over it, rake, firm again and rake again. Repeated raking is important for levels, etc. A week or so before seed sowing rake in a general fertiliser. You will need to water both seed and young grass for the summer.
Autumn time allows you more time though so patience is best.