All the dealers have a hold on the cars until they get an updated dealer bulletin to release them, I do not think it has anything to do with gearboxes, just to stop anyone having there car early. There was a bulletin on the brake booster, unless it's a new one today?
My dealer told me that JLR had embargoed road use of all DSs the other week, with no explanation from them. This was rescinded mid last week and is why I suddenly got a call to say I could have one for the day, and chose last Thursday. I think it was just a precautionary 'hold' while they checked something out.
When I took it back, my dealer said that my 27 March date had now become 20 - 27 March.