I've always used LED bulbs and has no problems with MOTs. I clip my load resistors on with scotch locks.
Reading the spec it says interior use. Would I fail the MOT with these fitted and are the Canbus adapters someting you have to solder into the loom?? "Please be aware that this range of Philips X-treme Vision Festoon LED bulbs is designed for interior use. They can be used in an exterior application but it is not road legal to do and, in addition, due to technical differences between LED and halogen technology, a vehicle warning light may be triggered depending on the configuration of your vehicle. This is more likely to happen if your car was manufactured after 2005. This pack contains two Philips CANbus warning cancellers for LED lamps to solve this issue."