I've just returned from several unusual countries in Asia, and annoyingly despite being told I'd have no problem, I'm unable to find anyone in London to change back to pounds.
I've tried Travelex in Heathrow, a currency exchange place, and the post office.
The currencies include cash from: Mongolia, Kyrgyzstan, Kazakhstan and Uzbekistan.
Most of the responses when shown the money is to the tone of "What the hell currency is this?" which doesn't fill me with confidence.
Any suggestions welcomed for places that may change this. Otherwise I may need to go back next year ;)