I've done the search and I can't really find the answer to my question. I guess the two best bulbs are Philip Extreme Vision and/or Osram Nightbreaker so any thoughts on either or both would be appreciated, then where to buy as they are pretty expensive.

The reason I'm asking is that I bought a pair of "white box" low cost jobbies and they are OK but not great - I guess you get what you pay for but are the much more expensive bulbs brighter/better ?  Geoff

Used nightbreakers a few times seem an improvement over OEM. There are some new bulbs out one of the mag's did a test on a few weeks ago but I think the nightbreakers came back best value for money. Some reports of them not lasting as long but mine always lasted while I had the vehicle.
ta Mine was a blue one!

+1 for the Nightbreaker Unlimited, have had them a month and are better than the OEM and cheap Chinese bulbs I had before. If you want a more bluish white tint then the Cool Blue Intense are also popular. Tom

Current Drive
2011 4.4 TDV8 Autobiography - Santorini Black - Ivory Leather

Previous Drives
2004 Model Vogue Td6 (Touchscreen) - Java Black - Parchment Leather
1994 RR Classic 3.9 V8 Soft dash - Niagara Grey - Grey Leather
1972 Series III SWB Safari - Green (Hand Painted) - Black Plastic

Osram nightbreaker unlimited are awesome bulbs and legal too. I fitted them to a disco 2 and they are as good if not better than the xenons in the FF. What are you fitting them in? 2004 RR 4.4 V8 Autobiography

I'm actually replacing the HID bulbs in my FF so not H7 but D3S Geoff

I changed mine a bit back, have a read here,

http://www.fullfatrr.com/forum/topic28567.html

So "Lad" from reading the thread it looks like you got plenty of benefit. I seem to have similar problems - lights starts off bright and immediately gets dimmer. The beam pattern looks OK, not too worried about the H7s they seem to work fine.

I'll get some ordered  Geoff

Yes, mine started bright but went dim. The new ones were a lot brighter. Could see further down the road.

I think 2010MY onwards have both.
Dipped beam is Xenon 35w
Main beam is both xenon dipped and halogen 55w.
Drivers manual says xenon is also 55w, but this is a mistake.
You want to improve bulbs you should be changing both really.
I have Philipps racing vision for the H7 and Nightbreakers for the xenon.
😄