You obvisouly don't know how to read METAR.
EGLL 051550Z 22026G37KT 9999 SCT042 15/04 Q1000
I have highlighted the pertinent part for you, winds from 220 degrees at 26kts, gusting to 37kts. High winds reduce the arrivals rates causing delays. The winds have been like this all day and flights have been delayed.