I,ve had my RRS for 6 months, and I noticed today, one of the low beam Xenons bulb had blown.
Before I ring the dealers, do any members now if these bulbs or covered by the warranty.
I've checked the handbook, and its says the buldb changing has to be done by qualified personnel, and also that the alignment should be checked by Land Rover afterards
If i have to pay for the bulb, how much

That should be covered as the normal life of a Xenon bulb is way beyon 6 months.

On my Mercedes I kept the Xenon bulbs for 3 years / 150.000KM, and I use them a lot. 08.5 RRS TDV6 HSE Java Black/Alpaga - Cold Climate Pack - Privacy Glass - Bluetooth - Sunroof - 20" wheels - Rubber Floor mats.
07 Mini Cooper Cabrio - Astro Black - Leather Recaro seats - Chili Pack - Chrome Pack - Chrono Pack - Extra Lights - JCW/K&N engine tuning - John Cooper edition.

Previous cars:
Mercedes C 270CDI - Opel Vectra GTS 2.2DTI - Volvo V40 1.9DTI - Mercedes C 220CDI

I was told by Morrison's of Stirling that they are guaranteed for 10 years or 10000 times switching them on! Take the car into the dealer because they are warrantied by the lamp maker.
Being the owner of dull greyish coloured cars I tend to drive with mine on all the time these days like Volvo/Saab daylight running lights. 2020 Pangea Green 1st Edition D240 New Defender 110 is here and loving it
2018 Melting Silver Mini Countryman PHEV - soon to be replaced
2015MY Corris Grey SDv6 HSE Dynamic, the best car I have ever owned, totally reliable only a cou0le of rattles in 3 years, now no longer in my care
Also in my garage is a 1996 TDi300 Defender 90 County HT made into a fake CSW

Turns out it was a loose wire in the connecting block, all sorted now