I have just received some images from a contact which are very interesting. They all have the office ident 000000 which was last used at Trafalgar Square/William IV Street office in July 2012. The images may be seen on the Stamp Magazine website under Forum and Post and Go/Faststamps.
The examples appear, from postmarks, to have been posted in Bideford/Exeter/Devon area and dated 29 November 2012. They routed to the Heathrow World Distribution Centre (HWDC) and processed on IMP3. HWDC processing was as expected.
However, there are some major irregularities in the font used and the introduction of a new rate "Worldwide upto 30g" rate.
Images and full story may be found at: www.sites.google.com/site/pmechuk/
I have made contact with a few others and had replies suggesting that the items are very likely forgeries. If you have similar examples, please email me at email@example.com.
Apologies, I am having some problems uploading pictures to my blog site at the moment.