My 4/4 build started on 24th February 2014 and I drove it away on 3rd April.
There was a little delay in getting the car due to a clash with Geneva Motor Show and the DVLA introducing a new method for registering vehicles which meant MMC had to apart to a new system.
At the time I made my order I was told prices would increase by about 3% a year but comparing price lists for one year to next you can see the increases are not uniform across the range or even extras so, in my experience, the estimate of increases was not very accurate.