The Venga has just had a facelift so they got rid of old versions first and busy building new 6 speed autos now.
I suggest you ring Kia Customer Services on 0333 202 2990 who can tell you exactly when you will get your new Venga as dealers rarely get accurate delivery times.
All they'll need is your name and what dealer you ordered it from.
All manufacturers try to build to order in batches now, and 12 weeks is, unless the car is in stock, not enough lead time. Therefore very soon, Motability will be introducing the system to replace the 3 months notice to order your new car to 6 months in advance so you won't have to wait upon its exchange time.
By the way, the Venga is a fab car and worth the wait I assure you.
Paul