Maybe SQ3J8 ?
Just trying to contact him now . They might have got on another flight already not sure .I know he was eventually flying into heathrow and earlier on he put on his facebook page that he was at changi airport Singapore but i got a feeling its this flight . Just got this info off heathrows arrivals board .
19:10 SQ318 SINGAPORE CONTACT AIRLINE Terminal three 19:10 VS7320 SINGAPORE CONTACT AIRLINE Terminal three