Blyth's Reed Warbler

Just had a BLYTH'S REED WARBLER in East London.  Well I heard it anyway, and there were a lot of birders there talking amongst themselves.  A great find by whoever it was.  So when I left, there was some suggestion that it may be a Marsh Warbler.  Good to question things I suppose.  Played the clip at home, sounds like a Blyth's to me but I understand the argument.

Just got back from Poland where the birding was intense and gripping.  Such variety.  It felt free and unadulterated, but more of that later.