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It's about 100ft, and is fairly level. The edges are all straight, only stopping where I've planted fruit trees. I've got a strimmer for the edges and those bits though.
I was thinking petrol too, so thanks for the link... even though they were all really expensive. I was thinking less than 100 quid... or is that not possible for a decent one? Hmmmm...
I did think about getting it laid again, but it seems like such a massive job. Also, I think if I was going to do that, I'd probably wait until next year now, as it's not gonna get much use from the kids now.
I'll have a look at my current one, and see if I've got it set to "too low", though I'm not even sure if it's got this option.
Thanks again to all :-)