Fracking is a technique used to release gas and oil from shale rock.
- It involves drilling down before fracturing layers of rock using a pressurised liquid.
- Water, sand and chemicals injected into the rock then allow gas to be released.
- The process enables petroleum, natural gas and other substances to be extracted.
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Winter sunshine with cloud creeping in during the afternoon and a frosty night ahead.
The Revd Canon Joanna Penberthy will be consecrated as Bishop of St Davids at Llandaff Cathedral.
Temperatures will tumble under clear skies tonight with a widespread frost developing.