Regions will do their best to find a post for you if you choose to specify that you are not willing to be placed anywhere within the region, but this is not always possible. Remember you are joining a training programme that is probably already almost full and certain locations are already filled within programmes. 

You will only be considered for the region/s as a whole, if you select on your application form that you are happy to be offered a post anywhere within your chosen region/s. If you do not take the offer, this will not affect any future application.