5 young Spotted flycatchers ready to go in Norfolk

How late were they arriving this year? I certainly could not find any until late May then to my amazement I stumble on the nest of 5 nestlings ready to fledge. Maybe they started as soon as they arrived and used what looks to me more like an old Robins nest to save time.They are declining so fast 5 more is brilliant news. I will be watching and hoping they all survive