STOCKHOLM, Sweden - The development of McLaren's P1 is nearing its end; only a few months remain until 375 wealthy customers take delivery of the British automaker's latest supercar.The automaker hopes to ensure that its P1 delivers on its promise of being "the best driver’s car in the world on road and track" - or, in this case, on a frozen lake...As part of durability testing (and in the hope, we assume, of having more than a little fun) McLaren put its P1 through its paces in frigid northern Sweden. The testing schedule continues at pace, with prototypes being tested across the globe.HEADED FOR FESTIVAL OF SPEEDThe P1 is powered by a 3.8 twin-turbo good for 542kw at 7500rpm and 720Nm at 4000rpm. It's electric motor produces 131kW, to a total of 673kW and combined torque of 900Nm. The P1 can reach 100km/h in less than three seconds and top speed is listed as 370km/h. As part of its 50th anniversary celebrations McLaren will showcase a P1 at the 2013 Goodwood Festival of Speed in England.Watch the P1 in action!