TntConnect is a free program for managing your relationships with your ministry partners. Although anyone might find it useful, it is designed specifically for missionaries who raise their own support.
Generally, the state pension scheme is a very good investment. The UK Government has most of the information you might need about the state pension scheme, including a section about when you work or live abroad. You can request a pension forecast any...
Many mission organisations run a recycle programme for these sorts of items to raise funds. Contact your favourite mission to ask if they do. (one service that provides this for charities is https://www.envirofone.com)