I believe that you have three years to sell your UK home if becoming resident elsewhere:
Absences as you've moved out of your home
You may still get the full relief even if you didn't live in your home all of the time that you owned it. The final 36 months (3 years) that you own it will be treated as if you lived there, even if you didn't, as long as the property has been your only or main home at some time during the time that you owned it.
http://www.hmrc.gov.uk/cgt/property/sell-own-home.htm#2
There are other things to concider such as the Uk state pension etc, depending on age etc.
You also have to realise that the Pound is very very weak against the Swiss Franc.
To give you an idea; in my situation; I sold my house (it fell through at last minute) in August 2007 for £690K when the pound was CHF 2.40
Today, realistically, I would get £600k for the house and the pound is under CHF 1.60
The loss in property value and currency exchange works out at 42% fall since August 2007.