Carb icing isn't just controled by the temperature, if it's cold and damp that's far more likley to cause a prob than cold and dry. Try a fuel additive such as the silloline or fuchs ones to see if this helps. Also check the connectors to the float bowl heaters are on securely.
TBH the fact you had the choke replaced 2 weeks ago would put it on my suspect's list, always look at things that have been done recently 1st! When changing the choke cable the carb heater cables may have been knocked loose, they're not a million miles away.
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