Given that both BA and BD uses large amount of A-320 family, plus many of the other European airlines use A-320 families into LHR, one gets the impression that A-320 family dominates the LHR sky.

First the A-320's
http://www.pbase.com/mugong/image/115335753
http://www.pbase.com/mugong/image/115335761
http://www.pbase.com/mugong/image/115335685
http://www.pbase.com/mugong/image/115335687
http://www.pbase.com/mugong/image/115335737
http://www.pbase.com/mugong/image/115335749
http://www.pbase.com/mugong/image/115335757
http://www.pbase.com/mugong/image/115335759
http://www.pbase.com/mugong/image/115335750
http://www.pbase.com/mugong/image/115335746
http://www.pbase.com/mugong/image/115335747

http://www.pbase.com/mugong/image/115344896
http://www.pbase.com/mugong/image/115344882
http://www.pbase.com/mugong/image/115344889
http://www.pbase.com/mugong/image/115344760
http://www.pbase.com/mugong/image/115344803
http://www.pbase.com/mugong/image/115344829
http://www.pbase.com/mugong/image/115344854

http://www.pbase.com/mugong/image/114821568
http://www.pbase.com/mugong/image/114821627
http://www.pbase.com/mugong/image/114821630
http://www.pbase.com/mugong/image/114821633
http://www.pbase.com/mugong/image/114821693

Now a few B-737
http://www.pbase.com/mugong/image/115345335
http://www.pbase.com/mugong/image/115345327
http://www.pbase.com/mugong/image/115345331
http://www.pbase.com/mugong/image/115345348
http://www.pbase.com/mugong/image/115345326
http://www.pbase.com/mugong/image/115345330
http://www.pbase.com/mugong/image/115345332

And 3 757s that we don't see in the US...
http://www.pbase.com/mugong/image/114822188

This Titan Airways' 757 is a rare find.
http://www.pbase.com/mugong/image/114822179

http://www.pbase.com/mugong/image/114822182