The Deputy Prime Minister is visiting Somerset and Devon Fire & Rescue Service in Taunton.
The fire service is losing 17% of its government grant over the next two years, meaning it has to find £5.5m of savings.
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The Post Office said it was 'business as usual' but unions said Saturday's industrial action was getting solid support.
Workers and managers are to stage another strike on Saturday amid a long-running dispute over jobs, pensions and closures.
Cloudy in the West with a few showers. Sunny in the East but cold.