Dream Land
I'm no pilot but the sight of an Airbus (most often a BA A320/A319) leaving its undercarriage down well after take off is not at all uncommon at LHR.
I at first used to wonder what the problem was but then there was a PPRUNE thread on this a couple of years ago that explained it was to do with brake cooling after the aircraft has been waiting for extended periods to line up.
Actually never seen a A330/A340 do it though.