With small numbers at Further Maths, in yr 12 we teach M1, M2 and S2 (plus the C3/C4 calculus) alongside the normal AS course C1, C2, S1 and then M3 or S3, FP1, FP2 alongside the normal A2 course C3, C4 and D1. This works OK but leaves too much Pure for year 13. However, it does enable pupils to pick up either AS or the full A level in Further Maths after year 12. We give full allocation to both subjects (290 mins a week)
We try to enable our best mathematicians to do some Add Maths or C1 work in year 11. If C1 has been mostly covered, we sometimes put the Further Mathematicians into the Year 13 A2 classes alongside Year 12 AS giving them C1-C4, S1 and D1 in year 12. We then use our 290 minute allocation to split the year 13 Further Mathematicans into a seperate group and can thus teach the modules in a more sensible order.
With the new FP1, I suspect we will continue as above, but teach FP1 instead of S2 in year 12 on model one.