The best replacement for m56 is 550i.

The best alternatives to m56 are rated as following:
★★★★★  550i
★★★★  m54
★★★★  m37
★★★  bmw 550i
★★★  e550
★  m45
★  genesis r spec
  m54 bmw
  lexus ls 460
  mercedes e550

Your alternative for m56 is not listed? Suggest!
Speaking about m56, one probably shouldn't forget about m6 junction.

Other search terms related to m56 and their ratings are:
★★★★★ m6 junction
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m56
550i
m54