You can't yet get the Compomotive 18s in the US? These do fit round the Brembos. 

Yes, now you can. Still, the Comps are over $500 a pop here by the time you figure duties and exchange rate (probably more now that the US$ has gone further down the toilet), so it becomes almost as expensive as buying an extra set of Stormers for offroading purposes!  

I have been looking at this exchange and I would like to ask for some asistance.

Perhaps foolishly I have joined a trip to Morocco in September beleiving my RRS TDV8 HSE 2008 model can cope with the terrain which I believe will be sand, rocks, gravel, etc. I am told the original wheels and tyres which are 275/40/R20 are unsuitable but Land Rover insist they are fine. Can anyone confirm this?

Assuming the originals are unsuitable I have yet to find any alternative wheels - preferably ones that require no modification, since the brakes are, I understand, larger in my model than the TDV6.

It has been mentioned that the Disco 3 19" wheels will fit. Does anyone know if this is correct? Is there any other alternative as I would prefer 18".

I have been going round the houses with this one. I have no technical knowledge unfortunately.

Thanks.

Get a set of 19's with Goodyear MTRs - that's what I have and you'll be fine with them. RRS 2.7 TDV6 HSE Zambezi silver,Alpaca.
On Order - LRX expected 2010
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Im glad i didnt get my 22's. Tong would have been alot more amusing .