After a long walk through head high reeds and nettles, I got to the area where it had been staying and saw a couple of other birders who kindly confirmed it was still here. I had a short wait for it to come to our side of the River Weaver and then another wait for the sun to appear. It was all very worthwhile though as I got to see this lovely bird in all it's Summer plumage. Stunning.
And just for comparison, here it is alongside a Great Crested Grebe.