the coil packs went 5 days into owning the car,
Unfortunately a known problem with mk5. Make sure all coil packs are replaced - replacing a faulty one somehow precipitates the failure of the others.
when i first start my car it sounds alot like a Diesel
Normal.
also am getting a bit of rubbing when im hard lock left....
Get it checked out. Shouldn't happen.
and finally MPG.. not sure if this is typical of the GTI but ive probably done about 90 miles and used half a tank. this has all been in london traffic but am getting average mgp on all my journeys of less than 22mpg..
Depends on driving style (ie how hard you're pressing with the right foot). I used to get something similar in a stop-start journey over 5 miles on a 10 mile commute to work.
25mpg is typical around town.
30-35mpg is more typical on DC/motorways but you still have to be prudent.