All interesting points raised about what elements are regular Mk IV and what are Lightweight. I seem to recollect that a customer could order a car from AC with certain features that could be different from car to car. From the posting, it seems the original owner purchased the car from a London dealer, so it was not exactly perhaps a U.S. spec car? For instance, my U.S. spec. MK IV had the small rubber pieces mounted on the front bumper over riders (now replaced with Hawk pieces) which this car does not have. It has two windshield wipers vs. the three on the standard Mk IV like mine, which is shown specified on the paperwork in the EBay listing. The flat dash seems to have been specifically ordered as well. Based on the chassis/serial number, as it does not have the "L" in the mix, it most likely is a standard Mk IV modified to have some non-standard features, such as the two vents on either side of the front grill opening. A neat variation, but it seems that unless the EBay seller has specific knowledge that it is a "Lightweight" car, the ad is misleading.