If you do wish to give Lizzie and Allen a wedding present, the only gifts they would really like are your donations to either Teenage Cancer Trust, or the Robes Project, or both.
This is the donation page for the Robes Project. JustGiving does take a small percentage of donations that go through their website (up to 5%) - if you would prefer to donate directly to the charity for this or any other reason, you can do so here: http://robes.org.uk/support-us/donate/
Robes Project provides shelter and warm beds to people without homes in Lambeth and Southwark throughout the winter. Saint Peter's is one of the local churches that are involved in providing this service. We would like to support this excellent charity, and also our local church, which plays an important role in the community.