It's been confirmed that Dorchester Prison is to close and discussions are underway to end the lease at Dartmoor Prison.
Elsewhere, Portland's Verne Prison will be turned into an immigration detention centre.
The former Victorian military barracks, transformed into a jail more than 60 years ago, will become a Home Office immigration unit housing people waiting to be removed from the UK.
Duncan Sleightholme reports:
More top news
It's not just visitors at Exmoor Zoo who've been tucking into ice lollies and cool drinks in the heat - check out these charming pictures
A memorial is to be held for a man from Bodmin who was killed during the Tunisia massacre. His wife is recovering in hospital
Part of a Somerset street has been sealed off after the discovery of a large dip in the road. Engineers are investigating what caused it.