GasGas 125 or 250 bike

[noddy]

Thinking of getting a brand new one of these

How difficult is it to road register ?

As im only 10 stone soaking wet, want a bike for greenlaning, want somthing light with lowend power.

Have a honda fes125 scoot for all other uses

My work commute is about 10 miles a day return.

What would the pitfalls be ?

Does say on the website that you can, but any info before i phone them this week would be good.
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Current ride: Honda Pantheon FES 125 2003.
Previous bikes: Suzuki TS50x, Honda MTX125, Suzuki AP50, Gilera Runner 180sp.