LLANTRISANT, WALES - DECEMBER 16: Mail workers process Christmas mail at the Royal Mail Christmas sorting office in Llantrisant on December 16, 2016 in Llantrisant, Wales. Hundreds of temporary workers are employed over the Christmas period to process the increased volume of mail. (Photo by Matthew Horwood)
LLANTRISANT, WALES - DECEMBER 16: Mail workers process Christmas mail at the Royal Mail Christmas sorting office in Llantrisant on December 16, 2016 in Llantrisant, Wales. Hundreds of temporary workers are employed over the Christmas period to process the increased volume of mail. (Photo by Matthew Horwood)
LLANTRISANT, WALES - DECEMBER 16: Mail workers process Christmas mail at the Royal Mail Christmas sorting office in Llantrisant on December 16, 2016 in Llantrisant, Wales. Hundreds of temporary workers are employed over the Christmas period to process the increased volume of mail. (Photo by Matthew Horwood)
LLANTRISANT, WALES - DECEMBER 16: Mail workers process Christmas mail at the Royal Mail Christmas sorting office in Llantrisant on December 16, 2016 in Llantrisant, Wales. Hundreds of temporary workers are employed over the Christmas period to process the increased volume of mail. (Photo by Matthew Horwood)
LLANTRISANT, WALES - DECEMBER 16: Mail workers process Christmas mail at the Royal Mail Christmas sorting office in Llantrisant on December 16, 2016 in Llantrisant, Wales. Hundreds of temporary workers are employed over the Christmas period to process the increased volume of mail. (Photo by Matthew Horwood)
LLANTRISANT, WALES - DECEMBER 16: Mail workers process Christmas mail at the Royal Mail Christmas sorting office in Llantrisant on December 16, 2016 in Llantrisant, Wales. Hundreds of temporary workers are employed over the Christmas period to process the increased volume of mail. (Photo by Matthew Horwood)
LLANTRISANT, WALES - DECEMBER 16: Mail workers process Christmas mail at the Royal Mail Christmas sorting office in Llantrisant on December 16, 2016 in Llantrisant, Wales. Hundreds of temporary workers are employed over the Christmas period to process the increased volume of mail. (Photo by Matthew Horwood)
LLANTRISANT, WALES - DECEMBER 16: Mail workers process Christmas mail at the Royal Mail Christmas sorting office in Llantrisant on December 16, 2016 in Llantrisant, Wales. Hundreds of temporary workers are employed over the Christmas period to process the increased volume of mail. (Photo by Matthew Horwood)
LLANTRISANT, WALES - DECEMBER 16: Mail workers process Christmas mail at the Royal Mail Christmas sorting office in Llantrisant on December 16, 2016 in Llantrisant, Wales. Hundreds of temporary workers are employed over the Christmas period to process the increased volume of mail. (Photo by Matthew Horwood)