About 80 Royal Marines from Alpha Company are due to land at RAF Brize Norton at about 2pm. They'll then be transported to Norton Manor Camp near Taunton by coach, greeting friends and family at around 6pm.
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Bridgwater and West Somerset is considered a Conservative safe seat - in 2010 they had a majority of over 9,000 votes.
Camborne and Redruth is a marginal seat. The Conservatives won it in 2010 by just 66 votes - a 0.16% majority.