Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Returning to the UK after working in Switzerland, What to do with my Swiss Francs?
If you "have no immediate plans for the money and will probably not return to Switzerland for a long time or at all" then it might be best just to exchange the money so then you can use/invest it in the UK.   Maybe keep a bill or two for memory-sake - I do that whenever I travel to a foreign country.