I have a theory about Lotus' omission from GT7 which may seem a bit controversial.
The brand obviously doesn't have a problem when it comes to video games, as it can be found in Assetto Corsa, The Crew Motorfest, Forza Horizon, Forza Motorsport and even Need For Speed so there's clearly an issue at PD's end. It does seem odd that such a well-known brand is totally absent from GT, unless you consider the F1500-T a Lotus 97T. What's stopping them, you ask? Well I have a compelling conspiracy - PD don't want to pay Lotus because other manufacturers will ask for more money, thus exposing their stingy license deals. There is a possibility that PD are underpaying license holders, and they don't want that to be exposed. Other game developers have been able to stump up the cash so why can't PD with the financial backing of Sony? This could also help to explain the absence of Silverstone. Maybe I'm wrong but I have to scratch this itch or I'll go mad.