Posted: 13/07/2014 at 17:25
Thanks everyone for your helpful answers. I looked at them this morning and the brown patches are actually shrinking, so I think it must be caused by animals. We did see a fox about a year ago, but nothing since. Unfortunately you cannot watch the garden 24/7 to find out what is out there!
Again, many thanks - I knew I would get some sensible replies from you guys.