The precancel stamp society of GB membership is available through their website:
About the Society
With its membership drawn from the UK, mainland Europe and North America, the PSS-GB has been active for over 50 years in catering for collectors interested in precancelled stamps and postal stationery.
What are Precancels?
Pre-cancelled stamps, or precancels, were introduced by various countries as a means of saving time, reducing costs in handling certain classes of mail and as a deterrent to theft.
This was done by allowing authorised users to affix stamps already cancelled on to bulk mail, thus avoiding a time-consuming step in processing at the post office. Pre-cancelled items had to be handed in at a post office and only the holder of the license was able to do so.
The former National Postal Museum was in part established to house the collection. Today, The Postal Museum has taken over responsibility for caring and developing access to the Phillips Collection.
Germany is one of the most interesting and challenging countries to collect even in its basic form without specific specialisation. If you were to just collect Germany it would keep you interested and busy for many years. Below is a high-level breakdown of the basic areas of German philately. Each area in its own right could be a specialisation if you so wish.
The Postal Stationery Society is for collectors of Postal Stationery worldwide, no matter what your area of interest is.
The PS Journal is in full colour and is issued four times a year, in February, May, August and November. It includes a mix of articles, queries, news, discussions and opinions, all related to postal stationery.
The TPO & Seapost Society is the dedicated to collectors interested in Travelling Post Offices (TPO) both on Railways and on the High Seas (Seapost). Members collect TPO and RPO postmarks and covers, sea post and paquebot marks, ship and packet letters, and other maritime postal history. Membership is world-wide as are the topics covered.