Parliament voted in favour of building the Successor nuclear powered submarines that will carry the Trident nuclear missiles from the early 2013s onwards, when the current Vanguard submarines will come to the end of their lives.
Welsh MPs voted as follows:
| Against building Successor submarines to carry the Trident nuclear weapons | Did not vote | In favour of building Successor submarines to carry the Trident nuclear weapons |
| Ann Clwyd | Christopher Elmore | Guto Bebb |
| Jonathan Edwards | Chris Evans | Kevin Brennan |
| Paul Flynn | Chris Bryant | |
| Nia Griffith | Alun Cairns | |
| Carolyn Harris | Stephen Crabb | |
| Liz Saville-Roberts | Wayne David | |
| Jo Stevens | Christopher Davies | |
| Hywel Williams | Byron Davies | |
| Mark Williams | David Davies | |
| Glyn Davies | ||
| Geraint Davies | ||
| James Davies | ||
| Stephen Doughty | ||
| David Hanson | ||
| Simon Hart | ||
| Susan Jones | ||
| David Jones | ||
| Gerald Jones | ||
| Stephen Kinnock | ||
| Ian Lucas | ||
| Madeleine Moon | ||
| Jessica Morden | ||
| Albert Owen | ||
| Christina Rees | ||
| Nick Smith | ||
| Owen Smith | ||
| Mark Tami | ||
| Nick Thomas-Symonds | ||
| Craig Williams |
The official record of the debate, recording all the speeches, is available here: