Yes, it was from this book I believe. Also found this http://researchbriefings.files.parliament.uk/documents/RP03-82/RP03-82.pdf http://researchbriefings.files.

Yes, it was from this book I believe. Also found this http://researchbriefings.files.parliament.uk/documents/RP03-82/RP03-82.pdf http://researchbriefings.files.parliament.uk/documents/RP03-... where it seems like retail prices where relatively stable at that time.