Not answering the original question but I think some of you might find this interesting.
There was a well reported UFO sighting at the Devils Garden in the 70's involving a group of students and a landed UFO and spacemen and a cow.
More importantly to me. My mum was from Frodsham and told me that there is a bit of a family legend about the place. Her dad was a poacher and told my mum and her 4 brothers and sisters never to go there alone as it was 'a bad place'. This was never explained but my mum said that this was not like him and that she felt he had good reason to say it. They had been there with him and it was a beautiful part of the river Weaver but she remembered him making a point of it when they were there.
Prior to that, apparently one of my mums aunts was seeing a lad nearby and the Devils Garden was a convenient cut through for secret liaisons. She knew it wasn't somewhere she was supposed go after dark but with love on her mind she did so one night and saw what she described as a knight in shining armour in what was then a meadow at the Devils Garden. She ran home terrified and only told my mum and sister years later after she read the news article about the supposed UFO sighting.
I'm not one for woo stuff but I remember my hair standing on end when my mum told me about it.
