Hi Frank,
Should you wish to kill a bit of time waiting for the price list, you could grab the most current Trad price list of a Plus 4 from the UK and compare that to what the price list was for the US Plus 4. Should give you an idea of what level of pricing Morgan might be asking for the new Plus Four.
As for leather seat backs, all Trads have had leather seat backs. For me at least, I've had zero issues. Then again I don't normally put anything behind the seats that might cut/dig/damage the leather.
Soft vs. Pebble : The pebble grain will be harder wearing but the soft grain does feel buttery smooth. The colours are also slightly different, where they share colours that is. I truly recommend that the retailer show you physical samples if possible or at min use images from the used car locator from Morgan and compare.
Good luck
P
