Where can i get a decent learner legal 125cc bike? (Scotland)?

as i have just moved back to scotland from the US, i dont really know many places to tell you to look, but i have seen some very good deals on motorcycles on Gumtree.co.uk i myself have been riding much bigger bikes & own a GSXR 1000 , & A HYABUSA 1600 so the 125cc is a little outside of my knowledge but apparently they are a popular size bike here goodluck on your hunt & ride safe!!