Just lately the changes of printers, and the inability of any of them to match shades properly have led to a lot of new Stanley Gibbons numbers, such as for these 5p stamps:
The Darwin - which was darker than anything before it - is SG Y1743s (chocolate) - the lighter shade is not separately mentioned in the Concise catalogue.
The Classic Album Covers stamp has the wrong font - SG Y743t.
The Britain Alone stamp is Y1743sb (red-brown), and the WWF version is Y1743sc (lake-brown).
The newest 5p stamp, from the Aerial Post Centenary PSB - new SG Concise number awaited.
And a similar situation applies to other values such as the 10p
And if there is anything that you need and can't see, please send us a site email with details and we will tell you whether or not we can help.