It would be interesting, (to an anorak like me) to know if the LEDs in a Sport headlamp are replaceable or if it is a whole unit job. My guess would be its "Sorry sir, that will be a new headlight at £ lots!"
No, they are not replaceable. If one or more Led emitter fail, you have to change the whole headlight unit.
But we should consider the lifespan:
halogen bulbs last 300-600 hours;
xenon bulbs 2000-4000 hours;
led emitters, when well cooled, last more than 25000h.
Halogen and HID bulbs have to be replaceable, Led emitters last as long as the car.
IMHO it's definetly better to have powerful headlights all along the year than have snow melted during some days in winter and low performance headlights.
Look at the difference between the 3 technologies from page 14...
http://mkdb.hella.com/hellamk/upload/MKData/977_90mm_Gesamtbroschuere_HELLA_EN.pdf In Italy LED headlights are standard on sport and elegance trims (should be the EX in UK), shape and joints are the same of halogen headlights but electrical connections are different.