Time to replant with grass seed - sold loose so you get best value for money and just the right amount.

Grass seed is sold loose so you get the best quality seed at the lowest possible price, and just the quantity you need, whether you just have a few patches to fill in or a whole new lawn to plant.  There is hardwearing, with rye grass, suitable for a family garden, or fine, without rye grass, if you're after a prize lawn.