Well Bren,
There has been a reduced takeoff distance from 09R recently due to problems at the threshold, requiring aircraft to depart from the Block 100/102 stopbar. Also traffic from the South has to line up from the Block 100 loop. A Virgin A340 the other day needed 09L for departure because the TODA was insufficient on 09R, so I suspect that several other long haul aircraft have been in a similar position recently. Not sure about the "bumps" though.