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If I've read it right no commercial licence for microlights and also only require a class 2 medical to instruct....
Yes, that's right.
You can also factor in a massively decreased cost to gain your NPPL (M) compared with a PPL and then wet hourly costs of just £20 in a hot ship 3 axis like a Eurostar (if you own it that is!), or about £45 per hour if you join a syndicate.
Not sure what crash 1 is referring to when he says you will learn more.....you can certainly add extra ratings to your PPL like night and IMC which you can't (currently) to an NPPL, but from the point of view of flying you'll learn just as much in a 3 axis microlight as in an SSEA........IMHO.