Update v1.1 incl. Brit Pack DLC:

Cars
Added Ultima GTR Series (Road & Race versions)
Added F-Trainer Series (Novice & Advanced specs)
Added MCR Sports 2000 Series
Added Caterham cars series - 270, 360R, 620R

Tracks
Added Brands Hatch (2 layouts, GP & Indy)
Added Cadwell Park
Added Oulton Park (4 layouts)

Features & Fixes
Added Radio Spotter feature
Improved vehicled shaders & applied to all older cars along with skin adjustments
Adjusted rear wing efficiency on Montana, StockV8, Boxer Cup, Superkart, Ultima GTR
Adjusted tires on F-V12, Montana, StockV8, Boxer Cup, Ultima GTR
Adjusted AI Torque Stab in all cars to reduce their excessive stability when in contact with player car
Added Vehicle Configuration menu to Vehicle Showroom
DynHUD: Improved Delta widget functionality in Time Trial mode
Updated vehicle shaders
Added new batch of community drivers
F-Vee: Main LOD optimization for better performance / lower memory load
Metalmoro: Main LOD optimization for better performance / lower memory load
Boxer Cup: Adjusted mirror position
SuperV8: Added configuration option for cockpit type

EDIT: V1.1.1 hotfix now added for the following:
Corrected multiplayer mismatch with both Brands Hatch layouts
Adjusted F-Trainers, Caterhams fuel consumption
Adjusted camber gain in Caterham 270