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Thank you Sher. So it sounds by what you say I have to wait for them to stop coming which seems to be the opposite of what calm is saying LOL. I put the dish right outside my patio doors and I see them come and go. They have several entry points under the fence around the garden. Once the dish is empty they disappear into the borders to feed themselves and I can hear them snorting around. I also hear a noise of the dish being moved on the slabs during the night. I love it;-) I think I'll carry on feeding for the moment and check one of the hedgehog sites on line and see what they advise. But it's good to hear the experience of others.
Ah yes, the scats chips, oneway of knowing they are about for sure. Thank you both.