As above, the new course should correlate to C1-4, some of M1 and M2, some of S1, and I think one or two topics from FP1 have made their way into the core course (?)
The Further Maths Support Group, despite the name, have a variety of resources for both Maths and Further Maths, and in particular have a set of webpages specifically outlining the content of the new A-levels and how they compare to the old ones.