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The R.M.Phillips Collection (BPMA)Scans of all 45 volumes from the British Postal Museum and Archive.
CollectGB Stamps (Robert Jones)Most GB stamps, presentation packs, FDCs etc illustrated.
Missing Imprimaturs (Ian Wright)Scans of stamps missing from the imprimatur sheets, searchable for plating purposes.
The LE Files (Andrew Patmore)Notes and essays on the Line Engraved stamps, especially Die 1 perf.
Penny Black First Day Covers (Mike Jackson)From the book May Dates.
Penny Black plating site (Ian Wright)Large database of 1d black images
The Imperforate Issues (1840-1853) (Chris Jones)Virtual representation of a collection
"My Victoria" (Chip Gliedman)Imperforate Line Engraved from Plate Position 'CG'.
1887 Jubilee Issue (Ricky Verra)Stamps and covers, including overprinted issues, and a blog of noteworthy items.
Les WilkinsonArticles by a past GBPS President, concentrating on KGV-era topics.
Deegam PublicationsProducers of the highly detailed Deegam Catalogue of Machin stamps.
The Connoisseur Catalogue of Machin StampsOnline version of this catalogue with PDF chapters.
Machin Mania (Roy Simpson and Larry Rosenblum)Blog on Machin topics.
Great Britain Machins (Robin Harris)Canadian site with listings and plenty of illustrations.
Post and Go Checklists (Stuart Leigh)Detailed downloadable checklists of the Post and Go "Faststamps".
Smilers Information NotesLinks to PDFs by the author of the Smilers Catalogue.
Norvic Philatelics Blog (Ian Billings)Up to date news on current GB stamps, Post and Go labels etc as it comes in.
GB Stamp Booklets (Paul Ramsay)£sd Postage Stamp Booklets of Great Britain. Detailed and very well illustrated.
GB Stamp Rolls (Paul Ramsay)£sd Postage Stamp Rolls of Great Britain. Detailed and very well illustrated.