This marks the first phase of a prisoner-release plan reached earlier this year.
Trade minister Liz Truss made the announcement on Tuesday saying the government had complied with a court order that came about after a legal challenge from campaigners and reviewed how the arms were used.
UAE and Saudi Arabia to give $200m in aid to Yemenis of all backgrounds
The lifeline port of Hodeida has been at the centre of the ongoing Yemeni war this year — here are the key events.
Yemen's warring factions have agreed a ceasefire for the vital Red Sea port of Hodeida
The monthly death toll in the strategic port city was up 164% in June-August from the first five months of the year.
All parties in the Yemen conflict have committed war crimes, according to a damning new report by U.N. experts.
In the report, they point to possible crimes on all sides between March 2015 and June this year.