2001 Rover 25 problems found with code reader

Here are the codes read with the diagnostic reader.

P1232 , P0262, P0261, 0264, P0265 and relevant codes for cylinders 3 and 4.

P1568. How do I go about fixing this? This is for the rover that had an erratic starting problem, especially when the engine had been running.

Any help is very much appreciated.