Bear in mind though that they often quote including manufacturer offers.Yes, its legit.
It's cheaper because list prices are horribly inflated and used to get plenty of money out of those who don't really seem to notice anything but the monthly figure.
As an example recently they were showing 6500 off list for a vRS, digging deeper though 3000 was a Skoda PCP 'deposit contribution'. So in reality it was only 3500 being offered by broadspeed versus what you'd get from a dealer and only applied if you bought via PCP.
