All new tyres sold by reputable dealers in the U.K have to meet a BS-ISO standard, I'm pretty certain that while the grip level and braking distance of some tyres isn't as good as others none of them are actually dangerous. The only case I can recall where tyres were actually dangerous was in The U.S involving Firestone/Bridgestone tyres fitted to SUV's and Light trucks 3 or 4 years ago I think.
Pete
even so I bet below 3c the sv-2 will outperform most summer tyres.