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"£400 for laying a bit of turf? They must have seen you coming."
OK!
Thanks to all that gave suggestions.
We're going to have to get some pegs and string, at least until the lawn has bedded in, but I think we'll have to eventually go down the route of Scramber's suggestion.
This fox in particular is so brazen it's unbelievable, he's not scared of the dog, though he won't come in the garden if the dog is out there. He sits on the roof of the shed next door, teasing him. Then we caught him sitting in my border without a care in the world...until we rattled the door handle pretending to let the dog out.
Wolfy, he may well pee there, but as it's only been down for 24 hours, he hasn't done so as yet.