Not sure, but maybe there were some delays, due to this:
EHAM 081755Z 25014KT 230V290 4500 VCSH FEW005 BKN007 FEW032CB 18/17 Q1015 NOSIG
EHAM 081725Z 26016KT 220V290 5000 -TSRA FEW012 SCT032CB 19/17 Q1015 BECMG 8000
EHAM 081655Z 19031G42KT 2500 TSRA FEW025 BKN032CB 19/17 Q1015 BECMG 22015KT 9999 NSW
EHAM 081625Z 15008KT 120V190 7000 -TSRA BKN032CB 26/19 Q1013 TEMPO VRB12G22KT 4500 TSRAGR