Just checked the site and unfortunately they've gone up by about £40 since I bought mine....now £265.99 for the pair. Still far better value than BMW GSA spots, Touratech etc. IMHO.
They operate independently of the main lights and come with a very nice stainless steel handlebar switch.
I don't know how they are wires as Jono at ABW fitted they for me and at present I am part exchanging the single cam in the photo for a twin cam and the bike is at Jefferies having the lights transferred to the new bike.
Mike