cheapest best gass seed for large lawn patches? easy to grow

[cestlavielife]

what is best gras seed/ seed fertiliser combo for large patches (was under a climbing frame) .

needs to be easy to throw on and ignore other than a bit of watering..and withstand kids running around within a short time...
have seen stuff like
www.windeals.co.uk/grass
or lawn mats -any good ?

www.windeals.co.uk/mat.

I don't know about good but I buy HUGE boxes for around a fiver from Lidl once a year to replace worn/mossy patches. They do a family, a shade and one of those ones that are half seed, half feed.

It was an offer a couple of weeks ago but some stores seem to have stock left. Maybe not the easiest option for instant results but it must be one of the cheapest

Wilkinsons do a good deal on one with plenty of hearwearing ryegrass in the mix.