This is a give-away poster by TSB Bank
At some point in 1993, TSB Bank did a charity collaberation of some kind with Sega & Sonic and created this poster to give away in exchange for dontations to charity. The poster has rolling Sonic atop a coin, but the coin has a Tails face on it....however, because the coin is supposed to be rolling, the face looks dizzy/swirling. The background is all Sonic Chaos, Spinball & the word for Sonic CD, however, all the graphics are chaos/spinball related. The sheet at the right is Sonic face stickers where it says "Every Penny Goes To Charity". The yellow card is a sticker from the poster box with instructions:
Roll poster faced inward, stick shut with a sticker, give when anyone donates at least 1 pound to the cause. (The jumping Sonic sihlouette is a nice touch here) This is likely overstock of some kind that didn't get given away. A nice campaign for a good cause.