It's difficult to forecast waiting time, but the availability of plots on Alderman Moore tends to be marginally quicker than the other sites where you could wait up to 30 months before a plot becomes available. Choosing "No Preference" can reduce the waiting time.
"Bower Ashton sites" in the choices below includes:
Bower Ashton and White City. The lists for the remaining sites (KL1/2 and Meadows are currently closed due to excessive length)