Armed with a thermometer, two hard-left France Unbowed (LFI) MPs Paul Vannier and Carlos Martens Bilongo visit the Val-d'Oise prison, in northern France, to report on the detention and staff working conditions during the current heatwave in France. 'There are not enough prison officers to rearrange the schedule of a day, for example to organise a second recreational walk in the hottest hour,' said Vannier after the visit. IMAGES AND SOUNDBITES