[quote="Morph"][quote="rainier"]In my opinion, CAA should allow a "grandfather clause" for existing "heavy microlight" pilots - perhaps with a check ride validation by a suitable instructor and give them their Sports Pilot rating based on experience. That would be fair.
Rainier[/quote]
Yes yes yes, I see absolute perfect reason in that proposal. We should put it forward
IMHO me SPL should be Class 4 medical, 35 hours training by a suitably qualified instructor (current MPL 3-axis boys are more than qualified), current MPL ground school and exams. the additional hours whould be taken up by performance and handling issues of a high performance 3-axis, spins, wing-overs, STOL takeoff and landing using flaps and 4-stroke maintenance
There is no real difference in flying 450kg and 600kg, except they are more sluggish and an engine out is really interesting, i.e. falls like a brick.

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Morph
The sport Pilot license is only going to require a class 4 medical, the same as MPL so you should have no problem.
If there is hours that need to be completed for the upgrade you can do those in your own plane anyway so its not going to cost a fortune either.