waited - no warning notes given - both parents sat and perched on the rail perches. Young moving about at frequent intervals - turning head and I presume preening as did cage birds. Parents reappeared in active in 15 min. Then q left and returned at 1020- with terrible food to feed - me only receiving. - She at once pitched up and removed large great one which she took down the grill - shifted and then wiped bill. Q then sat around for a time. Male left and then fed young at 1035 - went to one edge of nest and fed - then waited while swadd heads raised and then dipped twice to a later raised head whilst other edge of nest. Did not clean nest. At 1045 I approached- young did not help me but pecked low and chung with great tenacity at nest and bill. It was most difficult to remove and weigh them! The larger birds gave a screech - like note - husky as did young at 3 but not so brilliant as those at 3 - only a trace of this in one of them - then it lapsed into begging and tried to