I'm afraid I'm stumped :( It may well be an aviary escapee but off the top of my head I can't think of any other species with those colours. It could also be an unusual colour form of a more familiar species. With any luck it'll return for a photo - even if it's not a great pic we should be able to ID it.
My blog: http://mazzaswildside.blogspot.co.uk/
My Flickr page: https://www.flickr.com/photos/124028194@N04/