I am in the process of selling off a large all world stamp collection (or accumulation to be more precise) that I have put together during the past 40-odd years. Some of the material has not seen the light of day in that time, and I use only basic or simplified catalogues several years old so there will be bargains! I try to describe all items as accurately as possible but not being an expert in any field, I have undervalued rarities (I know this because several collectors/dealers have emailed me asking for more of the same to be put up for sale).
I just ask that only those genuinly interested in my material make bids. Postage & packaging costs will be kept as low as possible and I always obtain a Certificate of Posting from the post office......just in case. For your peace of mind, it would be preferable to opt for Recorded Delivery or Registered Post - I cannot be held responsible for Royal Mail's shortcomings! Multiple sales will attract a post discount at cost which will be shown on your invoice.
If any item is reported as 'lost in the post' or 'not delivered' I will send you the Certificate of Post or Recorded delivery receipt for you to claim from Royal Mail. I will, of course, answer any questions from Royal Mail on your behalf.
Good Hunting.