Repeating myself: (again)
On 13th January I wrote a short piece on Miniature sheets, in which I quoted some of the catalogue prices for these issues. Dave Feeney informed me that the prices which I quoted are not the true catalogue prices, but actual (market) selling prices. ".
For further market prices this catalogue entitled British Stamp Market Values 2009 from the publishers of Stamp Magazine, has a comprehensive listing of every Great Britain issue from 1840 to date.
The prices listed inside relate to real values based on actual market activity, not catalogue prices.
More than 7,000 philatelic items are listed and priced, in over 230 pages which are in colour. One chapter deals with advice on how and where to buy your stamps. It also has a comprehensive watermarks guide.
This can be purchased from Dewalders of Salisbury England for £9.99, Postage UK costs extra at £1.50.