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Returning to the UK after working in Switzerland, What to do with my Swiss Francs?
A general principle in finance is that you shouldn't stick with an investment or situation just because it's how you're currently invested. You can ask yourself the following question to help you think it through: If, instead, I had enough GBP to buy 20000 CHF, would I think it was a good idea to do so? (I'm guessing the answer is probably "no.") This way of thinking assumes you can actually make the exchange without giving someone too big of a cut. With that much money on the line, be sure to shop around for a good exchange rate.