Posted: 06/03/2014 at 18:25
I wouldn't do that this year. Scarify it with a rake to pull up any thatch/moss. Go all over it with a fork; just make loads of holes to bring air into the soil. Then gently disturb the earth where it is bald and sow some grass seed. Protect it with lots of twigs set at angles to keep the birds and humans off. Also consider making a path on the high traffic areas.
If you are making new beds in lawn areas, save those bits of grass and lay them where the lawn is bad, obviously at the same height as the rest of the lawn. There is a great technique for remedying bad edges (I hope I can explain it without pictures); take out a bit of turf where the lawn edge is bad and simply turn it aroun so the good turf is next the flower bed. Then rake up the surface a bit and sow your new seed.
There is a slight problem in getting grass seed to match. I was amused to see Kings Lynn Council gardeners got it wrong outside the Library where they got rid of 2 flower beds (financial cuts I guess) and sowed a much darker grass seed.