Thames Valley Police are working with specialist teams at All Saints Cemetery in connection with their search for the body of missing teenager Jayden Parkinson.
The 17-year-old went missing two weeks ago and her ex-boyfriend has been charged with her murder.
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Their warning depends on whether negotiations for a post-Brexit Britain do not offer freedom of movement for people, capital and goods.
Wednesday morning's weather for the east of the region
Wednesday morning's weather for the west of the region