Mae’r siop Hadau Mwstard yng nghefn yr eglwys ac ar agor ac eithrio yn ystod amseroedd gwasanaeth. Mae'r siop yn gwerthu cardiau cyfarch Cristnogol, llyfrau ac anrhegion bach. Mae cardiau gweddi, myfyrdodau a gwybodaeth am hanes y Drindod Sanctaidd ar gael yma hefyd.
The Mustard Seed shop is at the back of the church and is open except during service times. The shop sells Christian greetings cards, books and small gifts. Prayer cards, reflections and information on the history of Holy Trinity are also available here.
