Alan:
They cost an arm, a leg and two LED DRL Bi-Xenons!
I have priced this. If one wants the whole shebang, that is auto-levellers + cornering, the total cost is between £1400 and £1475, depending on exchange rates. Then add a five hour labour charge to get the lot up and running. The housings on their own cost approximately £800 for a pair.
An expensive mistake not to have factory ordered these.