In the US,
CFI = Certified Flight Instructor
CFII = Certified Flight Instructor, Instrument
A CFI can provide flight instruction toward your private pilot certificate.
A CFII can do that too, as well as provide flight instruction toward your instrument rating.
Total training costs for a career in flying can vary in the US, depending where you live, and the training program selected (military vs. airline sponsored academy vs. local airport, etc.)
Sorry I do not have info on flight costs in the UK.
Hope this helps!