Alvin,
Hopefully sorted the fuel problem out.
I think it was the filler pipe - just needed plenty of gunge and another jubilee clip to prevent further leaking.
Prior to fixing I did 220km on 50 litres of fuel - not exceptional.
Seems much better, but will monitor. No smells anymore.
Attached some pictures - not the prettiest part of the car
Fuel Tank1 Fuel Tank2 Fuel Tank3