Hello. I am awaiting to be a new member with 2010 TDV8. And I want to ask a question about TPMS. If I will order a second (winter) seto of wheels - Do I need a second set of sensors? Or they can be moved from the original wheels? Or is it possible to turn the system off?

Get another set, as they never come out intact

Like nbunney said - they never come out intact - you might be lucky because your original set are quite new but I dont think they are supposed to be changed as often as you may change the wheel. The nut which secures the valve to the wheel is made of a very light cast alloy with a small seal which could get damaged.

I brought myself a second set of new alloys then needed to fit some TPMS sensors. The valve/sensors were reasonably expensive from Land Rover Parts for what they are I thought (approx £65 each)

I have seen a couple of sets available on the eBay in recent months, but quite rare (cheapest were approx £50 for the set) - however the lowest retail price I have found was from The TYRE EQUIPMENT COMPANY Ltd.
www.tyre-equipment.co.uk

They were the Genuine OEM Part (no.65741-67) which LR/Jaguar use themselves, manufactured by VDO/SCHRADER. I had to purchase a set myself a few months ago (£183.30 inclusive for 4) and they were delivered within 12 hours of ordering them.

Also - they are self programming, which means you will not need to have the Pressure Warning Light switched off by a dealer - they reset the light themselves within a few times of switching the ignition on/off.

Does anyone know if the OE sensors will fit D3 wheels (6 spoke 19" to be exact)?

...and for the best prices on any Land Rover parts or accessories - contact "The Large One" on the disco3.co.uk forum - he quoted me substantially less than the prices you mentioned above