The following is taken from Twitter/Bird Guides;

An imm Purple Heron in flight south of Walton Heath landed on top of a tree briefly before disappearing behind other trees

The Purple Heron, probably a 1st summer, flew west in the area well south of Walton Heath. It landed briefly on top of a tree before flying off this was about 07:30 this morning.

I saw the same bird in the same area at 8.45 and having spent the morning in Shapwick was informed of another sighting subsequent to that time.

On Tuesday 17th June while on duty at the 1st platform at
Ham Wall, had good views of a probable Purple Heron in flight mid morning over the reed bed, it headed towards the water tower and dropped down.
I reported it to warden Steve Couch and a couple of local birders.