What happens if...
You are no. 2 as you turn final. You can see no. 1 just touching down.
You call 'G-ABCD final.' The FISO says 'G-CD, runway occupied, go around'. You decide you can land safely behind and to the right of the other aircraft, as the Rules of the Air state, so you call 'Negative, contact one on, landing, G-CD' and land.
Will the CAA come after you? Is the 'go around' instruction mandatory when issued by a FISO?
Tim