Well FWIW ....
as the tarmac appeared the flaps moved to their final position.
Many companies specify the aircraft should be fully configured by 1000' agl, below about 800' agl the crew would get multiple GPWS "nags" about configuration as in: "too low, flaps", or similar. Given that it's difficult to explain what you saw.
I clocked the speed at 156mph c.132 kts and then 5-8 secs later we hit the tarmac.......Was the landing speed good (it felt a little hot)?
I just happen to have a 777 FCOM in front of me
It says at 180 tonnes ( a fairly typical landing weight) Flap 25 Vref is 134 knots, Flap 30 Vref is 128. Given that you fly VRef +5 on final I'd say 132 knots sounds like a fairly normal final speed to me, it's certainly not "hot".
we hit the tarmac, port u/c first with lots of screeching - then the stbds hit flowed by,
Well you mentioned it was bumpy, so perhaps it was windy and there was a crosswind. From the Boeing 777 FCOM's section on crosswind landings: " If using a sideslip technique .....the sideslip should be stabilised before the flare".. In other words it is perfectly permissible to land the 777 wing down. It feels very (very) alien if you've spent a lot of time hours on something where the crosswind landing method is pushing the drift off and keeping the wings level. The sideslip/ wing down technique works really well on the 777, right up to the limiting crosswind of 40 knots.