London Motorcycle dealers (SGT, Fins) ?

Has anyone here ever bought a bike from SGT Motorcycles ? There were a few posts with positive feedback for them regarding servicing etc already on the forum but none about buying a bike from them. I’m looking at buying my first big bike this weekend and they have a few options in my price range. I don’t really know enough about bikes to be confident enough to buy privately. Other possible dealers I’ve heard good things about with bikes in my price range are Fins Motorcycles in Redhill and Jack Lilley although the later would probably be just out of my price range.