I have a 2009 car, do the newer cars have more CAN Bus on them

Hi PH. Not sure what you are after. Generally, all cars 2007 to 2012 have the same wiring. Although there was some minor lighting changes 2011. MY2013 onwards changed to LED tail lights and DRLs/signature lights dependent upon model. Also different dash, ICE, etc, so major changes there.

Bob 10MY (Sept 09) TD4 HSE Auto in Stornoway Grey (Now Gone)

08 FL2 TD4 SE Manual in Rimini Red (Now Gone)

I was thinking re headlights and fitting HID bulbs to main beam

Please, I understand the legalities

Please may I ask you to research on here about Hid bulbs in standard headlights, it technically doesn't work for optical reasons. The only way is to buy OE xenon headlights which optically have the proper matched bulbs and chrome eliptical reflectors. I fitted Hid and removed it the day after. I've documented it on here but don't know how to add the link.
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Hid aftermarket gives crap and dazzling results; sensible solution is Nightbreaker unlimited bulbs.
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Lots of cars manufactured over the last ten years have Canbus.
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Kind regards from Fred
. 2010GS Auto ex Celeb, Santorini Black, 2011 facelift , spoiler, spats, mudflaps, LED footwell lamps, Witter detach,
Other cars:-
1958 & 1959 Austin J40 Pedal Cars under restoration (I make many J40 parts)
If you have an Austin J40 or Pathfinder Pedal Car looking for a new home pls PM me.
2009 Meriva

So if I buy some proper 2nd hand units is it a straight swap or do I need other bits?

To be honest having read various positive and negative reviews I am think I may be better just to fit some spotlights if I want better lights.

Link to Fred's post: http://www.freel2.com/forum/post237665.html#237665

Bob 10MY (Sept 09) TD4 HSE Auto in Stornoway Grey (Now Gone)

08 FL2 TD4 SE Manual in Rimini Red (Now Gone)

Thanks Bob!!!!
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Regards from Fred
. 2010GS Auto ex Celeb, Santorini Black, 2011 facelift , spoiler, spats, mudflaps, LED footwell lamps, Witter detach,
Other cars:-
1958 & 1959 Austin J40 Pedal Cars under restoration (I make many J40 parts)
If you have an Austin J40 or Pathfinder Pedal Car looking for a new home pls PM me.
2009 Meriva