To all new members, you need to have a certain number of posts to be able to use the PM reply option. I believe it is around 30, this might seem a lot but it is to do with the volume of spam being sent. You can send an email or set up an email option in your profile.
If you post on a thread or follow that thread then you will be automatically notified when there has been a reply.
Hope maybe that explains a bit, now on with the sale of this lovely Raleigh