the tyres on the car don't match what they should be in the handbook. The tyres on the car are 175/65 R14 and in the book they should be 165/70 R13. Is this a problem or am I just being stupid? Also the tyres on the car are a mixture of 82T and 82H.
Should I be looking to replace all tyres with the same tyre type and getting the size that's in the handbook?
R14 means a 14 inch diameter and R13 means a 13 inch diameter (across the inner rim of the tyre) so it would appear that your car is on non-standard wheels.