Which means it's one of the recently issued Millennium Stamps, Drawn/Painted in 1912
The scene is "Bannockburn", by A Davidson.
Recently I've renewed my membership to the British Royal Mail Stamp Collectors Club. To join in the UK or Northern Island try your local Royal Mail Post Office.
Or else try writing to:

Andra Rigby
Collectors Club
Sunderland
SR9 9XN

Note: If you're not in England, Wales or Scotland Add:
UK

If you want to begin stamp collecting, first start ripping off the corners of envelopes, the bits with stamps on. Then get small squared paper, preferably proper stamp collecting paper but small squared paper will do.  Then get some already folded stamp hinges, make sure they are already folded, because it is difficult to fold them by hand. And I don't recommend trying. You should be able to get them at the post office or somewhere like that. Soak the envelope corners in water and the stamp should come off. Let them dry on a piece of kitchen roll, making sure the picture on the stamp is on the kitchen roll not the white bit on the back. Then leave to dry.

This is a Stamp hinge. The Darker part is the front bit and the light one the back

When dry lick the front part of a stamp hinge, the small bit, Then affix that part to the stamp, fast so as not to lose the stickyness, which renders the stamp hinge useless. Then lick the back part of the hinge, and put it on your squared paper, somewhere sensible. If you have two or more of the same stamp, joined at either side, or on top or bottom, stick them in, as they are more valuable (if only slightly.) If none get the one with the clearest image or the smallest postmark, and stick that one in.  What is very useful is a Book which has the stamps in by year, we have got a very useful cheap one that we found in a charity store in England, which tells us the date it was issued, and what it's called. Look in you charity shops, or second-hand book shops. If you want to splash quite a bit of money on one, there's such a thing as a "Stanley Gibbons" which is useful. To get some useful pages for sticking them on,if you have a printer, Try StampAlbum.Com Image Modelled in Blender