We are a broad group of UK civil society organisations, faith groups, academics and scientists. We write today to urge you to send UK diplomats to observe the First Meeting of States Parties of the UN Treaty on the Prohibition of Nuclear Weapons (TPNW), taking place in Vienna from 21-23 June 2022. We also call on the UK to attend the associated Vienna Conference on the Humanitarian Impact of Nuclear Weapons, hosted by the Austrian Government on 20 June. By doing so, the UK would be building on its participation in the original Vienna conference on this issue in 2014.