Out of Universe:
I was having a chat conversation recently regarding the TARDIS from the Doctor Who television series. I became curious as to how many TARDIS props were created for the television show beginning with the first episode that aired in 1963. I know that Doctor Who has a huge fan base. I was curious if any of the TARDIS props used were owned by private collectors or if there are on display somewhere.
I admittedly do not know much about this show. I have only seen about 3-4 episodes of the "new" Doctor Who. I tried doing research on the subject, but I am completely unaware as to which sources are credible and which are not.
My question is:
How many total TARDIS props were made for the television series beginning with the first episode in 1963 to present? If there are any props that are not being used in the show anymore, where are they located?
Note: I am only asking about the police box. Exterior only: